Let t0 be a specific value of t. Use Table to find t0 values such that the following statements are true.a. P(t≥t0) = .025 where df = 11b. P(t≥t0) = .01 where df = 9c. P(t≤ t0) = .005 where df = 6d. P(t ≥t0) = .05 where df = 18

Answer:

The answer to your problem is, C. It is continuous

( I saw that there is more than one answer than the other answer is D. )

Step-by-step explanation:

What a line graph is:

A line graph displays data that continuously changes over a period of time. It can be obtained from bar graphs and histograms ( every histogram is a bar graph ) by joining the mid-point of the top edges of every bar. This makes the analysis easier.

If you look in economic terms ( shown in picture ) everybody uses line graphs from small business owners to the president.

Thus the answer to your problem is, C. It is continuous

Picture of line graph used in economic terms. \/

The total wage bill for hiring 3 students to deliver the catalogues and leaflets will be 3 x £51.30 = £153.90.

Number is an abstract concept used to count, measure and identify a quantity. It is a fundamental part of mathematics, and is also used in many other fields, such as physics and computing. Numbers can represent both discrete, such as the number of people in a room, and continuous, such as the temperature outside. Numbers are also used to represent abstract ideas, such as the amount of money in a bank account.

In order to calculate the minimum number of students needed to deliver the catalogues and leaflets, we need to calculate how many catalogues and leaflets can be delivered in 8 hours by one student.

16 catalogues and 90 leaflets can be delivered in 1 hour by one student. Therefore, 128 catalogues and 720 leaflets can be delivered in 8 hours by one student.

Therefore, the total number of catalogues and leaflets that can be delivered in 8 hours by one student is 848 (128 + 720).

Since the total number of catalogues and leaflets to be delivered is 384 + 1890 = 2274, the minimum number of students required to deliver all the catalogues and leaflets is 3 (2274 / 848 = 2.67).

Therefore, the total wage bill for hiring 3 students to deliver the catalogues and leaflets will be 3 x £51.30 = £153.90.

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The horizontal translations of exponential functions only affect the range of the function. The domain remains the same, and the asymptote is unaffected.

The domain of the function still persists as the same – all real numbers. When it comes to range, its variation may occur due to a horizontal shift. If C > 0, then the range will offset upwards by the value of C units, whereas if C < 0, then the range shifts downwards with the magnitude of the shift having no influence on the contour of the function.

Furthermore, exponential functions have a fixed horizontal asymptote at y =0, that is not affected by any horizontal translations and which overtly remains equal to its original function.

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The vertex form of the quadratic equation is:

y = (x - 3)² - 16

To complete squares we need to use the perfect square trinomial:

(a + b)² = a² + 2ab +b²

The given quadratic can be rewritten as:

y = x² - 2*3*x - 7

We can add and subtract 3²  = 9 to get:

y = x² - 2*3*x + 9 - 9- 7

y = (x - 3)² - 16

That is the quadratic equation in vertex form, wehre the vertex is (3, -16)

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Answer:

p = 1

Step-by-step explanation:

3p = 5 - 2p

3p + 2p = 5

5p = 5

p = 1

a)The price in dollars he paid for each bowl is given by: 32/x.

b) his proposed selling price for each bowl was $ (64+3x)/2x

c) the sum of money received is 5 × (64 + 3x)/x

d)The sum of money received for them is 2x - 20

e) this equation is 13x² - 655x + 1280 = 0

f) the number of bowls bought by the stallholder is 40.

In mathematics, a fraction is a number that represents a part of a whole or a ratio of two quantities. A fraction is written in the form of a numerator and a denominator separated by a line, where the numerator represents the number of parts being considered and the denominator represents the total number of equal parts in the whole.

(a) The price in dollars he paid for each bowl is given by: 32/x.

(b) The proposed selling price for each bowl at a profit of $1.50 is the cost price plus the profit, which is:

32/x + 1.50

= (32 + 1.50x)/x

Multiplying both numerator and denominator by 2, we get:

= (64 + 3x)/2x

(c) For 10 bowls sold at this price, the sum of money received is:

10 × (64 + 3x)/2x

= 5 × (64 + 3x)/x

(d) The remaining bowls were sold at $2 each, so the sum of money received for them is:

(x - 10) × 2

= 2x - 20

(e) The total amount of money received by the stallholder is the sum of money received for the 10 bowls and the remaining bowls, which is given by:

5 × (64 + 3x)/x + 2x - 20

Simplifying this expression, we get:

(13x² - 572x + 1280)/x

Since the total amount received is $83, we have the equation:

(13x^2 - 572x + 1280)/x = 83

Multiplying both sides by x, we get:

13x²- 572x + 1280 = 83x

Simplifying this equation, we get:

13x² - 655x + 1280 = 0

(f) Solving the quadratic equation using the quadratic formula, we get:

x = (655 ± √(655² - 4 × 13 × 1280)) / (2 × 13)

x ≈ 40.31 or x ≈ 12.38

Since the number of bowls must be a whole number, the solution is x = 40. Substituting x = 40 into the expression for the selling price, we get:

(64 + 3x)/2x = (64 + 3(40))/2(40) = 2.15

Therefore, the number of bowls bought by the stallholder is 40.

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To make an 86% confidence interval with 15 data points (assuming normality), we would use a t-score of 1.341.

To find the t-score for an 86% confidence interval with 15 data points, we need to find the value of t such that the area under the t-distribution curve between t and -t (i.e., the area of the central region containing 86% of the probability mass) is equal to 0.86.

Since we have a small sample size (n=15), we need to use a t-distribution instead of a standard normal distribution. The degrees of freedom for the t-distribution is (n-1) = 14.

Using a t-distribution table or calculator, we can find that the t-score for a two-tailed test with a 86% confidence level and 14 degrees of freedom is approximately 1.341.

Therefore, to make an 86% confidence interval with 15 data points (assuming normality), we would use a t-score of 1.341.

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Note that the the five-number summary and interquartile range for each data set are:

Let's say the distances recorded for each airplane are:

Andre's: 18, 20, 22, 25, 28, 29, 30, 31, 32, 35

Lin's: 15, 16, 18, 20, 21, 22, 23, 25, 30, 33

Noah's: 10, 12, 13, 15, 18, 20, 21, 22, 23, 25

To find the five-number summary for each data set, we need to find the minimum, maximum, median, and quartiles. We can start by ordering the data sets from smallest to largest:

Andre's: 18, 20, 22, 25, 28, 29, 30, 31, 32, 35

Lin's: 15, 16, 18, 20, 21, 22, 23, 25, 30, 33

Noah's: 10, 12, 13, 15, 18, 20, 21, 22, 23, 25

Minimum:

Andre's: 18

Lin's: 15

Noah's: 10

Maximum:

Andre's: 35

Lin's: 33

Noah's: 25

Median:

Andre's: (28 + 29) / 2 = 28.5

Lin's: (21 + 22) / 2 = 21.5

Noah's: (18 + 20) / 2 = 19

First Quartile (Q1):

Andre's: (22 + 25) / 2 = 23.5

Lin's: (18 + 20) / 2 = 19

Noah's: (12 + 13) / 2 = 12.5

Third Quartile (Q3):

Andre's: (31 + 32) / 2 = 31.5

Lin's: (23 + 25) / 2 = 24

Noah's: (22 + 23) / 2 = 22.5

Interquartile Range (IQR):

IQR = Q3 - Q1

Andre's: 31.5 - 23.5 = 8

Lin's: 24 - 19 = 5

Noah's: 22.5 - 12.5 = 10

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This condition ensures that the distribution is not too skewed and allows us to use the Z-score to calculate probabilities.

(a) When we have a large sample size, the sample mean, X, follows a normal distribution with mean μ and standard deviation σ/√n, where σ is the population standard deviation. However, since we usually do not know the population standard deviation, we estimate it using the sample standard deviation, s. In this case, we use the t-distribution with n-1 degrees of freedom to calculate the 2-score, which has a slightly wider distribution than the standard normal distribution. To adjust for this wider distribution, we divide by the standard error, which is s/√n, instead of the population standard deviation a.

(b) We do not need the Central Limit Theorem to find P(X <72) if our sample size is 9 because the distribution of X is already normal. This is because the sample size is not too small, and we know the population standard deviation, so we can use the Z-score to calculate the probability directly.

(c) In order to convert 2 to a chi-square random variable, we need the assumption that the population follows a normal distribution. Specifically, if we have a random sample of size n from a normal population, then the sample variance s2 follows a chi-square distribution with n-1 degrees of freedom.

(d) In the Central Limit Theorem for 1 Proportion, we need to check the success/failure condition to ensure that the sample proportion, p, follows a normal distribution. Specifically, if np ≥ 10 and n(1-p) ≥ 10, then the sample proportion follows a normal distribution with mean p and standard deviation √(p(1-p)/n). This condition ensures that the distribution is not too skewed and allows us to use the Z-score to calculate probabilities.

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The temperature in the city with an elevation of -9m is 7°C.

Temperature is a definitive quantification of the amount of heat or chill precipitating from an item or environment, typically available in Celsius (°C) or Fahrenheit (°F) degrees and on the Kelvin (K) scale.

This absolute temperature scope starts at zero, translating to -273.15°C or -459.67°F when representing all sources of thermal energy's absence. Besides affecting appearance or state of an object, environmental temperatures can also modify physical traits.

Based on the graph, the temperature in the city with an elevation of -9m is 7°C.

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Therefore, the order-reversed integral is:

∫ba∫dcsin(x^2) dydx, where a= 0, b= 3, c= √(3y), and d= √(9y).

We have:

∫30∫3ysin(x^2) dxdy

To reverse the order of integration, we need to express the limits of integration as inequalities of x and y:

3y ≤ x^2 ≤ 9y

√(3y) ≤ x ≤ √(9y)

0 ≤ y ≤ 1

So, we have:

∫30∫√(9y)√(3y)sin(x^2) dxdy

Integrating with respect to x first, we get:

∫√(9y)√(3y) [-cos(x^2)/2] |_0^(√(3y)) dy

= ∫30 [-cos(3y)/2 + cos(y)/2] dy

= [-sin(3y)/6 + sin(y)/2] |_0^3

= (-sin(9)/6 + sin(3)/2) - (0 - 0)

= (-sin(9)/6 + sin(3)/2)

Therefore, the order-reversed integral is:

∫ba∫dcsin(x^2) dydx, where a= 0, b= 3, c= √(3y), and d= √(9y).

Note: We can also check the answer by evaluating the original integral and comparing it with the answer obtained by reversing the order of integration.

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When the interest is compounded quarterly the interest rate would be 7.26%  in order for Aria to end up with $68,000.

To solve the question :

The formula for compound interest :

A = P(1 + r/n)^(nt)

Where,

A = Amount,

P = Principal,

R = Annual interest rate,

n = Number of times the interest is compounded per year, and

t = time (years)

Given,

A = $68,000,

P = $23,000,

n = 4 ( as the interest is being compounded quarterly), and

t = 20.

Solving for r :

$68,000 = [tex]$23,000 ( 1+\frac{r}{4} )^{4 * 20}[/tex]

Divide both sides by $23,000 and take the 20th root of both sides,

we get :

[tex](1+\frac{r}{4}) ^{80}[/tex] = 2.9565

Take the natural log of both sides,

we get :

80 ln[tex](1 + \frac{r}{4} )[/tex] = ln (2.9565)

Divide both sides by 80,

we get:

ln [tex](1 + \frac{r}{4} )[/tex] = ln [tex]\frac{ (2.9565)}{80}[/tex]

Take the exponential of both sides,

we get:

1 + r/4 = e^(ln(2.9565)/80)

Subtract 1 from both sides and multiply by 4,

we get:

r = 7.26%

Hence, r =  7.26%.

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The integer has 6 positive divisors and the smallest non-negative integer with the given factorization is 12.

We can use the fact that the number of divisors of an integer is equal to the product of one more than the exponent of each prime factor in its prime factorization.

In this case, the prime factorization of our integer is p^2*q, so the exponent of p is 2 and the exponent of q is 1. Therefore, the number of positive divisors is (2+1)*(1+1) = 3*2 = 6. So the integer has 6 positive divisors.

For the second question, we're asked to find the smallest nonnegative integer with the given factorization. Since p and q are unique primes, the smallest possible values for them are 2 and 3 (in some order). If we let p = 2 and q = 3, then the factorization becomes 2^2 * 3 = 12.

So the smallest non-negative integer with the given factorization is 12.

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The value of t0.010 for a t-distribution with 26 degrees of freedom is 2.779. The critical t-value corresponding to a probability level of 0.010 and 26 degrees of freedom is approximately 2.779.

To find the value of t0.010 for a t-distribution with 26 degrees of freedom, follow these steps:
1. Identify the given information: We are given the probability level (0.010) and the degrees of freedom (26).
2. Consult a t-distribution table or use a calculator/software to find the critical value. Since t-distribution tables may not provide an exact value for every probability level, you may need to interpolate between the closest values given.
3. In this case, using a t-distribution table or software, we find that the critical t-value corresponding to a probability level of 0.010 and 26 degrees of freedom is approximately 2.779.
4. Round the answer to three decimal places, if necessary: The value is already rounded to three decimal places, so our final answer is 2.779.
Therefore, the value of t0.010 for a t-distribution with 26 degrees of freedom is 2.779.

To find the value of t0.010 for a t-distribution with 26 degrees of freedom, we can use a t-distribution table or a calculator that has a t-distribution function. From the table, we can look for the row that corresponds to 26 degrees of freedom and the column that corresponds to the 0.010 significance level. The intersection of the row and column will give us the value of t0.010. Alternatively, we can use a calculator to find the value of t0.010 using the t-distribution function. Assuming that the question meant to ask about a t-distribution with 26 degrees of freedom, and not 2626 degrees of freedom, we can find the value of t0.010 to be approximately -2.478, rounded to three decimal places. This means that the probability of getting a t-value less than -2.478 or greater than 2.478 is 0.010 or 1%.
It is important to note that the use of decimal places in rounding the answer depends on the level of precision required in the context of the problem.

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True.

The vector field F(x, y) = yi - xj has a rotational symmetry about the origin. To see this, we can consider the gradient of the scalar potential function U(x, y) = xy/2, which is given by:

∇U = (Ux, Uy) = (y/2, x/2)

We can see that the vector field F(x, y) is the negative of the gradient of U, i.e., F(x, y) = -∇U(x, y), so it has a rotational symmetry about the origin.

The magnitude of the vector F(x, y) is given by |F(x, y)| = [tex]sqrt(x^2 + y^2)[/tex], which is the distance from the origin. Therefore, the flow lines of F(x, y) are concentric circles about the origin.

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We will prove by structural induction that every common divisor of m and n also divides every member of the set L.By structural induction, we have shown that every common divisor of m and n also divides every member of the set L.

• Base cases: m, n ∈ L

• Constructor cases: If j, k ∈ L, then 1. −j ∈ L 2. j + k ∈ L

Base case:

For m and n, let d be a common divisor of m and n. Since d divides both m and n, it follows that d also divides m + n and m - n (by adding and subtracting the two equations following structural induction). Therefore, d is a divisor of both m and n, as well as of j and k in the base cases of L.

Constructor case 1:

Suppose that −j ∈ L and d is a common divisor of m and n. Then, −j = −1 * j and since d is a divisor of j, it follows that d is also a divisor of −j.

Constructor case 2:

Suppose that j + k ∈ L and d is a common divisor of m and n. Then, d divides both j and k, and therefore d divides (j + k).

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The drawing of each solid in three dimension is sketched and attached

Perspective views in drawing are a way of representing a three-dimensional object or scene on a two-dimensional surface. By using perspective, the artist can create the illusion of depth and spatial relationships between objects in the scene.

There are several types of perspective views in drawing, including:

One-point perspective: This type of perspective is used when the subject is viewed straight-on, and all lines converge to a single point on the horizon line.

Two-point perspective: This type of perspective is used when the subject is viewed from an angle, and two vanishing points are used to create the illusion of depth.

Three-point perspective: This type of perspective is used when the subject is viewed from a very high or very low angle, and three vanishing points are used to create the illusion of depth.

Perspective views are an essential tool for artists in many fields, including architecture, product design, and illustration. Understanding perspective is crucial for creating realistic and compelling images that accurately represent three-dimensional space on a two-dimensional surface.

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The orthogonal basis for the given basis B = {(6, 8), (1, 0)} is {u1, u2} = {(3/5, 4/5), (16/25, -12/25)}

To apply the Gram-Schmidt orthonormalization process to the given basis, we follow these steps:

Step 1: Normalize the first vector in the basis.

Let v1 = (6, 8).

Then, the normalized vector u1 is:

u1 = v1 / ||v1||, where ||v1|| is the magnitude of v1.

||v1|| = √(6^2 + 8^2) = 10

So, u1 = (6/10, 8/10) = (3/5, 4/5).

Step 2: Project the second vector onto the subspace spanned by the first vector and subtract the projection from the second vector.

Let v2 = (1, 0).

The projection of v2 onto the subspace spanned by v1 is:

projv1(v2) = (v2 * u1)u1, where * denotes the dot product.

v2 * u1 = (1)(3/5) + (0)(4/5) = 3/5

So, projv1(v2) = (3/5, 4/5) * (3/5, 4/5) = (9/25, 12/25)

The orthogonal vector u2 is obtained by subtracting the projection from v2:

u2 = v2 - projv1(v2) = (1, 0) - (9/25, 12/25) = (16/25, -12/25).

We can verify that the two vectors are orthogonal using the dot product:

u1 * u2 = (3/5)(16/25) + (4/5)(-12/25) = 0.

Thus, the Gram-Schmidt orthonormalization process has transformed the given basis into an orthogonal basis.

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To evaluate the sequence in recursive form, we can use the given recursive formula:

f(n) = -5 x f(n-1)

We are also given the initial value:

f(1) = -3

Using these, we can find the first few terms of the sequence:

f(1) = -3

f(2) = -5 x f(1) = -5 x (-3) = 15

f(3) = -5 x f(2) = -5 x 15 = -75

f(4) = -5 x f(3) = -5 x (-75) = 375

f(5) = -5 x f(4) = -5 x 375 = -1875

So the first few terms of the sequence are: -3, 15, -75, 375, -1875, ...

Note that this sequence is decreasing in magnitude and alternating in sign, since each term is multiplied by -5.

The standard deviation of the given set of data is 2.93.

To calculate the standard deviation of a set of data, we need to follow these steps:

Find the mean of the data set by adding all the values and dividing the sum by the number of values.

Mean = (7.2 + 8.9 + 2.7 + 11.6 + 5.8 + 10.2) / 6

Mean = 46.4 / 6

Mean = 7.73

Subtract the mean from each data value, then square the result.

For 7.2, (7.2 - 7.73)^2 = 0.0289

For 8.9, (8.9 - 7.73)^2 = 1.36

For 2.7, (2.7 - 7.73)^2 = 23.69

For 11.6, (11.6 - 7.73)^2 = 14.74

For 5.8, (5.8 - 7.73)^2 = 3.73

For 10.2, (10.2 - 7.73)^2 = 6.08

Find the mean of the squared differences by adding them together and dividing by the number of values.

Mean of squared differences = (0.0289 + 1.36 + 23.69 + 14.74 + 3.73 + 6.08) / 6

Mean of squared differences = 49.64 / 6

Mean of squared differences = 8.27

Take the square root of the mean of the squared differences to get the standard deviation.

Standard deviation = √8.27

Standard deviation = 2.93

Therefore, the standard deviation of the given set of data is 2.93.

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The probability that the proportion of red beads you select from bin b is higher than the proportion of red beads you select from the bin a is 0.005, assuming the proportions of red beads in each bin are 0.3 and 0.6 respectively.

To calculate the probability that the proportion of red beads you select from bin b is higher than the proportion of red beads you select from bin a, you would need to know the actual proportions of red beads in each bin. Let's say in bin a has 100 beads, of which 30 are red, while bin b has 200 beads, of which 60 are red.

To calculate the probability, you would need to use the formula for the probability of the difference between two binomial proportions being greater than zero:

P(p(b) - p(a) > 0) = 1 - P(p(b) - p(a) <= 0)

where p(b) is the proportion of red beads in bin b, and p(a) is the proportion of red beads in the bin a.

Using the binomial distribution, we can calculate the probability of selecting a certain number of red beads from each bin, and then use those probabilities to calculate the probability of the difference between the proportions being greater than zero.

For example, if we randomly select 20 beads from each bin, the probability of selecting 10 or more red beads from bin b is:

P(X >= 10) = 1 - P(X < 10)

where X is the number of red beads selected from bin b.

Using the binomial distribution with n=20 and p=0.3, we get:

P(X >= 10) = 1 - binom.cdf(9, 20, 0.3) = 0.236

Similarly, the probability of selecting 10 or more red beads from bin a is:

P(Y >= 10) = 1 - P(Y < 10)

where Y is the number of red beads selected from bin a.

Using the binomial distribution with n=20 and p=0.6, we get:

P(Y >= 10) = 1 - binom.cdf(9, 20, 0.6) = 0.979

Now, we can calculate the probability that the proportion of red beads selected from bin b is higher than the proportion selected from the bin a:

P(p(b) - p(a) > 0) = P(X >= 10) * (1 - P(Y >= 10))

= 0.236 * (1 - 0.979)

= 0.005

So the probability that the proportion of red beads you select from bin b is higher than the proportion of red beads you select from the bin a is 0.005, assuming the proportions of red beads in each bin are 0.3 and 0.6 respectively.

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We have f '(x) = 2 cos x − 2 sin x, so f"(x) = -2 sin(x) – 2 cos(x) which equals 0 when tan(x) = -1 . Hence, in the interval [tex]0\leq x\leq 2\pi[/tex], f"(x) = 0 when X = [tex]\frac{3\pi }{4}[/tex] and x = [tex]\frac{7\pi }{4}[/tex]

To find when f"(x) = 0 with the given f"(x) = -2 sin(x) - 2 cos(x), we need to solve the equation:
-2 sin(x) - 2 cos(x) = 0
First, divide both sides of the equation by -2 to simplify:
sin(x) + cos(x) = 0
Now, we want to find when tan(x) is equal to a certain value. Recall that tan(x) = sin(x) / cos(x). To do this, we can rearrange the equation:
sin(x) = -cos(x)
Then, divide both sides by cos(x):
sin(x) / cos(x) = -1
Now, we have:
tan(x) = -1
In the given interval 0 ≤ x ≤ 2π, tan(x) = -1 at:
x = 3π/4 and x = 7π/4.
So, in the interval 0 ≤ x ≤ 2π, f"(x) = 0 when x = 3π/4 and x = 7π/4.

The complete question is:-

we have f '(x) = 2 cos x − 2 sin x, so f"(x) = -2 sin(x) – 2 cos(x) which equals 0 when tan(x) = __ . Hence, in the interval [tex]0\leq x\leq 2\pi[/tex], f"(x) = 0 when X = [tex]\frac{3\pi }{4}[/tex] and x = [tex]\frac{7\pi }{4}[/tex]

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The standard deviation by taking the square root of the variance:
2 x 0.21 + 3 x 0.37 + 4 x 0.22 + 5 x 0.10 + 6 x 0.07 + 7 x 0.03 = 3.42
So the mean number of defects in the batch is 3.42.

Next, we can calculate the variance
(2-3.42)^2 x 0.21 + (3-3.42)^2 x 0.37 + (4-3.42)^2 x 0.22 + (5-3.42)^2 x 0.10 + (6-3.42)^2 x 0.07 + (7-3.42)^2 x 0.03 = 1.8074 ⇒ √1.8074 = 1.34
Therefore, the closest answer is 1.28.

To find the standard deviation of this variable, we first need to calculate the mean (expected value) and then use the formula for standard deviation.

Mean (Expected value) = Σ (Defects × Probability)
= (2 × 0.21) + (3 × 0.37) + (4 × 0.22) + (5 × 0.10) + (6 × 0.07) + (7 × 0.03)
= 0.42 + 1.11 + 0.88 + 0.50 + 0.42 + 0.21
= 3.54

Next, we find the variance:
Variance = Σ[((Defects - Mean)² × Probability)]
= ( (2-3.54)² × 0.21) + ( (3-3.54)² × 0.37) + ( (4-3.54)² × 0.22) + ( (5-3.54)² × 0.10) + ( (6-3.54)² × 0.07) + ( (7-3.54)² × 0.03)
= 0.477 + 0.273 + 0.094 + 0.211 + 0.168 + 0.103
= 1.326

Now we find the standard deviation by taking the square root of the variance:
Standard Deviation = √(Variance)
= √(1.326)
≈ 1.28
Therefore, the closest answer is 1.28. However, please note that this answer may vary slightly depending on rounding or the level of precision required.

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Answer: 35 children

Step-by-step explanation:

Let the number of children who play only football be f , the number of children who play only

tennis be t and the number of children who play both sports be b.

Since there are 42 children, f + t + b = 42.

Also, since the number of children who play tennis is equal to the number of children who play

only football, t + b = f . Therefore f + f = 42. So f = 21 and t + b = 21.

Finally, twice as many play both tennis and football as play just tennis. Therefore b = 2t.

Substituting for b, gives t + 2t = 21. Hence t = 7.

Therefore the number of children who play football is 42 − t = 42 − 7 = 35.

With probability we can predict that, Bennet will select a red marble about 60 times in 200 draws, which corresponds to option C.

Probability is a measure of the likelihood of an event occurring. It is a number between 0 and 1, where 0 indicates that the event is impossible and 1 indicates that the event is certain.

The probability of selecting a red marble on any given draw is the number of red marbles divided by the total number of marbles in the bag:

P(Red) = 15 / (8 + 7 + 15 + 20) = 15 / 50 = 0.3

Since Bennet is replacing the marble after each selection, each draw is independent and has the same probability of selecting a red marble. Therefore, the number of red marbles selected in 200 draws follows a binomial distribution with n = 200 (the number of trials) and p = 0.3 (the probability of success on each trial).

The expected value of the number of red marbles selected can be found using the formula:

E(X) = np

where X is the number of red marbles selected, n is the number of trials, and p is the probability of success on each trial.

Substituting the values we get:

E(X) = 200 * 0.3 = 60

Therefore, we can predict that Bennet will select a red marble about 60 times in 200 draws, which corresponds to option C.

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(a) [(k+1)(k+2)/2]² is the formula holds for all natural numbers n.

(b) k(k+1)(k+2) is divisible by 6, and the formula holds for k+1.

(c) k + 1 - 1/k < k + 1, hence n ≥ 3, (1 + 1/n)ⁿ < n related to natural numbers.

(a) For n = 1, 1³ = [1(1+1)/2]² = 1, which is true.

Assume that the formula holds for some arbitrary natural number k. That is, 1³ + 2³ + 3³ + ... + k³ = [k(k+1)/2]².

We need to prove that the formula also holds for k+1, that is, 1³ + 2³ + 3³ + ... + k³ + (k+1)³ = [(k+1)(k+2)/2]².

Starting with the left-hand side, we can simplify it as follows:

1³ + 2³ + 3³ + ... + k³ + (k+1)³

= [k(k+1)/2]² + (k+1)³ (using the assumption)

= [(k+1)/2]² * k² + (k+1)³

= [(k+1)/2]² * [k² + 4(k+1)²]

= [(k+1)/2]² * [(k+1)² * 4]

= [(k+1)(k+2)/2]²

Therefore, the formula holds for all natural numbers n.

(b) For n = 1, we have 1³ - 1 = 0, which is divisible by 6.

Assume that the formula holds for some arbitrary natural number k. That is, 6 divides k³ - k.

We need to prove that the formula also holds for k+1, that is, 6 divides (k+1)³ - (k+1).

Starting with the left-hand side, we can expand it as follows:

(k+1)³ - (k+1) = k³ + 3k² + 3k + 1 - k - 1

= k³+ 3k² + 2k

= k(k² + 3k + 2)

= k(k+1)(k+2)

Since k, k+1, and k+2 are consecutive integers, one of them must be divisible by 2, and one of them must be divisible by 3. Therefore, k(k+1)(k+2) is divisible by 6, and the formula holds for k+1.

Therefore, the formula holds for all natural numbers n.

(c) For each natural number n with n ≥ 3, (1 + 1/n)ⁿ < n.

Let n = 3. Then, (1 + 1/3)³ = (4/3)³ = 64/27 ≈ 2.37 and 3 > 2.37.

Assume the statement is true for some k ≥ 3, i.e., (1 + 1/k)^k < k. We want to show that the statement is true for k + 1, i.e., (1 + 1/(k+1))^(k+1) < k + 1.

Note that (1 + 1/(k+1))^(k+1) = (1 + 1/k * 1/(1 + 1/k))^k * (1 + 1/k) < (1 + 1/k)^k * (1 + 1/k) (by the Bernoulli inequality)

By the inductive hypothesis, we know that (1 + 1/k)^k < k, so we can substitute to get (1 + 1/k)^(k+1) < k * (1 + 1/k) = k + 1 - 1/k < k + 1.

Therefore, by mathematical induction, we have shown that for each natural number n with n ≥ 3, (1 + 1/n)ⁿ < n.

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The following parts can be answered by the concept of Converges.

A. For the series Σ(7n² + √n - 2) from n=2 to infinity, we compare it to the series Σ(7n²) which diverges since it's a polynomial with a positive degree. Therefore, the original series also diverges.

B. For the series Σ(1/(7n-3)) from n=1 to infinity, we compare it to the series Σ(1/n) which is a harmonic series and diverges. Since 1/(7n-3) ≥ 1/(7n), the original series also diverges.

C. For the series Σ(1/(n^(3/2) × ln²(n))) from n=3 to infinity, we compare it to the series Σ(1/(n^(3/2))). The p-series with p = 3/2 converges (p > 1). Since ln²(n) grows slower than n^(3/2), the original series converges.

D. For the series Σ(sin²(n)/(n² + 5)) from n=1 to infinity, we compare it to the series Σ(1/n²). The p-series with p = 2 converges (p > 1). Since 0 ≤ sin²(n) ≤ 1, the original series converges by direct comparison test.

E. For the series Σ(cos(1/n) / √n) from n=1 to infinity, we compare it to the series Σ(1/√n). The p-series with p = 1/2 diverges (p ≤ 1). Since -1 ≤ cos(1/n) ≤ 1, the original series also diverges by direct comparison test.

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