1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
wolverine [178]
3 years ago
13

How long would it take to travel 425 m at the rate of 50

Mathematics
2 answers:
Murljashka [212]3 years ago
4 0
425 / 50 = 8,5

There you go.
12345 [234]3 years ago
4 0

Answer:

8.5

ignore the rest jgfvj dfghjfdexfngjhvhb

You might be interested in
Cindy earned 35 bonus points. Farid earned b more bonus points than Cindy. Write an expression that shows how many bonus points
arlik [135]
# of points Farid has = b+35.

So the expression would be b+35.
4 0
3 years ago
Read 2 more answers
Which equation represents a line which is parallel to x = 0
levacccp [35]
I really don’t no so sorry hope u find the asset if you haven’t
7 0
3 years ago
Read 2 more answers
Popular culture may include changing trends in all of the following categories except __________. A. clothing styles B. history
VikaD [51]

The right answer is A

8 0
3 years ago
Read 2 more answers
Evaluate the expression 2n, if n = 4. first answer gets brainlist i'm on my exam now so im serious.
DedPeter [7]

Answer:

The answer is 8. 2n means 2*n, which is 2*4.

Step-by-step explanation

4 0
3 years ago
Read 2 more answers
The negative effects of ambient air pollution on children's lung function has been well established, but less research is availa
Helen [10]

Answer:

Step-by-step explanation:

Hello!

The objective is to estimate the population mean of the lung-capacity index (FEV1) the forced volume (in ml) of air that is exhaled in 1 second of children that came from households where coal is used for coal or heating or both. The researcher claims that the use of coal has a negative impact (reduces) on the mean FEV1.

a.

A sample of 512 children that came from households where coal is uses was taken, they obtained a sample mean of X[bar]= 1429ml and a standard deviation of S= 327ml

The study variable is X: the forced volume (in ml) of air that is exhaled in 1 second of a child that lives in a household where coal is used.

There is no information about the distribution of the variable, but the sample size is large enough to be valid to apply the Central Limit Theorem and approximate the distribution of the sample mean to normal:

X[bar]≈N(μ;δ²/n)

Using this approximation you can estimate the population mean using an approximate Z and 1 - α: 0.95:

X[bar] ± Z_{1-\alpha /2} * (S/√n)

Z_{1-\alpha /2}= Z_{0.975}= 1.965

[1426 ± 1.965 * (327/√512)]

[1397.60; 1454.40]ml

Using a confidence level of 95% you'd expect that the interval [1397.60; 1454.40] contains the true average of the lung-capacity index of Chinese children that live in households where coal is used for cooking, hearing or both.

b.

Now using a value of S= 330 and a CI of 95% you need to calculate the sample size required to get an interval amplitude of 50ml

To calculate the sample size given a determined confidence level and amplitude the best is to use the semiamplitude or margin of error (d) of the interval.

The semiamplitude is half of the amplitude. The general structure of a confidence level for the mean is "point estimate" ± "margin fo error"

Then the formula for the margin of error is:

d=  Z_{1-\alpha /2} * (S/√n)

If a= 50ml then d= 50/2=25ml

Z_{1-\alpha /2}= Z_{0.975}= 1.965

(d* Z_{1-\alpha /2})= (S/√n)

√n*(d* Z_{1-\alpha /2})= S

n= [S/(d* Z_{1-\alpha /2})]²

n= [330/(25*1.965)]²

n= 37.29 ≅ 38

You need to take a sample of 38 childre.

I hope it helps!

3 0
3 years ago
Other questions:
  • which has the greater volume: a 4 meter cube or a rectangular solid that that is 8 meters long, 2 meters wide and 2 meters high
    12·2 answers
  • The quotient of 12 and the product of 5 and t
    9·1 answer
  • The sum of three consecutive is 267. What is the largest integer
    5·1 answer
  • Write an expression for each quantity
    12·1 answer
  • Liam is making chocolate chip cookies the recipe. calls for 1 cup of sugar for every 3 cups of flour liam has only 2 cups of flo
    10·2 answers
  • In which number is the digit 7 ten time larger than it is in the number 794
    11·1 answer
  • A class of 50 students elected a class president. Candidate received 15 votes. Candidate B received 2525 votes. The remaining st
    5·1 answer
  • Lori owes her mom $400. She pays her debt off over 40 weeks.​
    9·2 answers
  • 2) Mr. Riley dove off a cliff that was 30 feet above the surface of the water and descended a total of 100 feet. Which of the eq
    5·1 answer
  • 2/3 + 1/3 x 3/4 in simplest form
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!