Mathematics College

The mean running time of a certain variety of nickel-cadmium rechargeable flashlight battery is known to be normally distributed with a mean of 8.5. A change in production method for this battery has been proposed, and a simple random sample of 64 batteries produced by the new method has mean running time of 8.72 hours. Assume the population is normally distributed with a standard deviation of 0.55 hour as known and remains unchanged, test a claim that the new production method improving the battery mean running time using 0.05 significance level.

Answers

Answer 1

Answer:

answer is a

Step-by-step explanation:

Related Questions

What is the slope-intercept equation of the line below?

Answers

Answer:

B y= -5/4x+3

Step-by-step explanation:

Using 3.14 for π, calculate the circumference and area of the circle below. Include your answer to the hundredths place.

Circumference:

feet and the area ft squared:

If you don't know the answer please don't respond need ASAP

Answers

Answer:

37.68

Step-by-step explanation:

How many solutions does this system of equations have?

Answers

Answer:

I believe the answer is '2 solutions'.

Step-by-step explanation:

Combine each equation, solve the resulting question which comes out as two seperate variables, x = -1.197-- and y = 7.3990. I believe your answer is '2 solutions' because of this.

Answer:

1 solution

Step-by-step explanation:

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Answers

Step-by-step explanation:

180° = m<A + m<B + m<C

180° = 45° +60° + m<C

180° = 105° + m<C

m<C = 180° - 105 °

m<C = 75°

In order to estimate the statistical difference between the average hourly wages of employees of two branches of a department store, two independent random samples were selected and the following statistics were calculated. Downtown Store North Mall Store Sample size 25 20 Sample mean $9 $8 Sample standard deviation $2 $1 A 95% interval estimate for the difference between the two population means is _____. Group of answer choices

Answers

Answer:

0.076 ; 1.924

Step-by-step explanation:

Given that :

_______Downtown Store ___ North Mall Store

n _______25 _______________20

Mean (m) _ $9 _______________$8

Sample sd_ $2 ______________$1

Standard Error (SE) = √[(s1²/n1) + (s2²/n2)]

√((2^2/25) + (1^2/20)) = 0.4582575

df = (25 + 20) - 2= 43

(m2 - m1) ± t(df = 43 , 0.025) * SE

(9 - 8) ± 2.01669 * 0.4583

(1 - 0.9242) ; (1 + 0.9242)

0.076 ; 1.924

Which of the followiIf set A = {3, 4, 7, 9} and set B = {8, 9, 10, 11}, then A∪B is

Answers

Step-by-step explanation:

A={3,4,7,9}

B={8,9,10,11}

now,

AUB={3,4,7,9}U{8,9,10,11}

={3,4,7,8,9,10,11}

hope it helps.

(MARKING BRAINLIEST) 100 points

Answers

Answer: 1) $0.76 per serving of pumpkin pie

2) 64 people

3)

1 1/3 cup sweet potatos

2 tablespoons + 2 teaspoons of white sugar

1 egg

1/4 teaspoon of salt

2 tablespoons of butter

2 tablespoons + 2 teaspoons of milk

1/4 teaspoon of vanillia

2 tablespoons + 2 teaspoons of brown sugar

1 tablespoon + 2 1/3 teaspoons flour

2 tablespoons + 2 teaspoons of peacans

Step-by-step explanation:

1) the total cost of the ingredients needed to prepare a pumpkin pie = $1.50 + ($2.59 / 6) + ($5.99 / 6) + $1.25 + ($3.79 / 2) = $6.075

if we cut 8 servings per pie, then the cost per serving = total cost of the pie/number of servings = $6.075 / 8 = $0.759375 ≈ $0.76 per serving of pumpkin pie

2) 1lb=16oz

24/6=4

4x16=64

Answer:

0.76 per serving of pumpkin pie

2) 64 people

Step-by-step explanation:

PLSSSSSS I NEED HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Simplify Expressions:
[tex]\sqrt{(3-\sqrt{19} )^{2} }[/tex]

Answers

Answer:

1.358899 or 3-\sqrt{19}

Step-by-step explanation:

either or

Which of the following slopes of a line passes through points (2, 3) and (4.7)?
5
2
3

Answers

Answer: 2

Step-by-step explanation:

7-3/4-2 = 4/2 = 2

Which diagram demonstrates the problem 4x 1/3

Answers

Answer:

B

Step-by-step explanation:

Question in picture below will give brainly.

Answers

Answer:

The Best answer would be The Third Option Below

Step-by-step explanation:

On Sunday, a local hamburger shop sold a combined total of 448 hamburgers and cheeseburgers. The number of cheeseburgers sold was three times the
number of hamburgers sold. How many hamburgers were sold on Sunday?

Answers

Answer:

How many hamburgers were sold on Sunday?

336

Triangles 1 and 2 have the angle measures as shown.
Which statement is correct about triangle 1 and triangle 2?
PLEASE HELP

Answers

Answer:

The second one or the last one, but those two are the ones i came up with

Step-by-step explanation:

Please help me fast!!!.

Ruben is touring New York City with his family. They want to visit the Empire State Building, Central Park, and Times Square before their dinner reservations at 8:00 P.M. They want to spend 1 hour and 30 minutes at the Empire State Building, 3 hours in Central Park, and 45 minutes in Times Square. What is the latest time Ruben's family can start their tour in order to make it to dinner on time?


Include A.M. or P.M. in your answer. Please help me fast!!!

Answers

Answer:

2:30pm

I hope this helps :)

What is the equation for the line in slope-intercept form?

Answers

Answer:

y = 8x

Step-by-step explanation:

I believe counting up from the origin to the last point gives a slope of 8/1 which there wouldn't be a y-intercept in the equation.

I WILL GIVE BRAINLIEST!!!

Answers

Answer: m = 4

Step-by-step explanation:

Given the equation [tex]\sqrt[2]{x-5} = 2[/tex], solve for x and identify if it is an extraneous solution.

x = 6, solution is not extraneous

x = 6, solution is extraneous

x = 11, solution is not extraneous

x = 11, solution is extraneous

Answers

Answer:

x = 6, solution is not extraneous

Step-by-step explanation:

If you go and plug in 6 then the equation works well and there are no extraneous solutions.

Me fitz and his family are at a restaurant for dinner their total bill is $73 mr fitz decides to leave a tip of 18 percent of the total bill for their waitress how much is the tip that mr fitz leaves

Answers

18% of $73 = $13.14
The tip Mr. Fitz left is $13.14

Solve:

7 (x -3)
What is the answer

Answers

Answer:

7x-21

Step-by-step explanation:

7(x-3)
7x -7 x 3
7x - 21

Which point represents the opposite of -2? 1 + 1 35 33 2 В​

Answers

2 if it is an option, but if not I would say 1+1. Sorry if I’m wrong hope this helps

What is the equation of 21 less than 11 times a number results in seven times a number decreased by 29 what is the number

Answers

Answer:

x=-2

Step-by-step explanation:

11x-21=7x-29

11x-7x=-29+21

4x=-8

x=-2

Why was the ancient Egyptian teenager confused?

Answers

Answer: her daddy was a mummy

Step-by-step explanation:

r6 = 6 + 40 solve for r ​

Answers

I’m not sure completely if I’m being honest but I get points

For the class field trip, the fourth grades at Jefferson Elementary School need to take buses. Each bus fits 55 students and there are 200 students in fourth grade. How many buses will they need?
3 buses
3 R20 buses
4 buses
None of these is correct.

Answers

you would need 4 buses to bring all the students because you would still have some students left to ride the bus if you only get 3 buses

They will need 4 buses.

What is division?

The division in mathematics is one kind of operation. In this process, we split the expressions or numbers into the same number of parts.

Given:

For the class field trip,

the fourth grades at Jefferson Elementary School need to take buses.

Each bus fits 55 students,

and there are 200 students in fourth grade.

The number of buses,

= 200/55

= 3.63

≈ 4.

Therefore, the need is for 4 buses.

To learn more about the division;

https://brainly.com/question/13263114

#SPJ2

What if it is asking you to divide and not multiply?

Answers

Answer:

Then you divide :)

<3 Enjoy,

    Dea

3. Tarzan went to the plant nursery and bought a tree that was initially 90 feet tall for his monkey friends to climb on.
After planting the tree, Tarzan made a table to record the height, h, of the tree, t years after it was planted. “Zero” is the time when he planted the tree.
t 0 1 2 3 4
h 90 105 120 135 150


(a) Use words to describe the relationship between the height of the tree and the number of years since it was planted.


(b) Write a two-variable equation to illustrate the relationship between the height of the tree and the number of years since it has been planted.

Answers

Answer:

ok im convuzed how do you buy a 90ft tree cuz that sounds fun

Step-by-step explanation:

pls lemme know

What is an equation of the line that passes through the point (−5,2) and is parallel to the line 4x-5y=5

Answers

4x - 5y = 5
4x - 5 = 5y
y = 4/5x - 1
Parallel = same slope
Y = 4/5x + b
2 = 4/5(-5) + b, b = 6
Solution: y = 4/5x + 6

which rectangle is similar to a rectangle 12 inches wide and 18 inches long

Answers

Answer:

do u have pics?

Step-by-step explanation:

Which expression is equivalent to 42 + 12? 7(6+5) 2(40+6) 6(7+2) 10(32+2)

Answers

Answer:

6(7+)

Step-by-step explanation:

1) Start by solving the original equation

42 + 12 = 54

2) Solve the other equations until you find a match

2a) Start with what's in the parenthesis

7(6+5) = 7(11) = 77

2b)

2(40+6) = 2(46) = 92

2c)

6(7+2) = 6(9) = 54

This is your answer

2d)

10(32+2) = 10(34) = 340

Answer: 6(7 +2)

Step-by-step explanation:

Calculate 42 + 12, which is 54.

Calculate 7(6 + 5), which is 7 * 11 = 77.

Calculate 2(40 + 6), which is 2 * 46 = 92.

Calculate 6(7 + 2), which is 6 * 9 = 54.

Calculate 10(32 + 2), which is 10 * 34 = 340.

And, we can conclude the expression 6(7 + 2) is equivalent to 42 + 12.

Duff says that 10 times as many as 5 tens is 5 thousands. Is duff correct

Answers

Answer: My guess is hes incorrect,  its 500 because we know 5 tens is 50 and if we make it ten times 50 it is 500

Answer:

No he’s not correct

Step-by-step explanation:

So he says that 10 times 5 tens is 5 thousands. 5 tens is 50. So if you do 10 times 50 it’s only 500 not 5 thousand. At least this is what I think you mean

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