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
Nataly_w [17]
2 years ago
9

Pls help me its due in 10 minutes!

Mathematics
1 answer:
zhannawk [14.2K]2 years ago
3 0

Answer:

7 hours

Step-by-step explanation:

You might be interested in
The length of a rectangle is 5 meters greater than the width. The perimeter is 150 meters. Find the width AND the length.
oee [108]

Answer:

L=62.5 W=12.5

Step-by-step explanation:

L=5W

150=2W+2(5W)

75=W+5W

75=6W

W=12.5

12.5×5=62.5

62.5+62.5+12.5+12.5=150

7 0
3 years ago
A manufacturer reported a sample mean = 22.0 g and a sample standard deviation = 2.5 g based on a sample of 20 of their products
tester [92]

Answer:

n=(\frac{1.640(2.5)}{2})^2 =4.2 \approx 5

So the answer for this case would be n=5 rounded up to the nearest integer

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X=22 represent the sample mean

\mu population mean (variable of interest)

s=2.5 represent the sample standard deviation

n represent the sample size  

ME = 2 represent the margin of error accepted

Solution to the problem

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

The margin of error is given by this formula:

ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}    (2)

And on this case we have that ME =2 and we are interested in order to find the value of n, if we solve n from equation (2) we got:

n=(\frac{z_{\alpha/2} s}{ME})^2   (3)

We can use as estimator for the population deviation the sample deviation \hat \sigma = s

The critical value for 90% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.05;0;1)", and we got z_{\alpha/2}=1.640, replacing into formula (3) we got:

n=(\frac{1.640(2.5)}{2})^2 =4.2 \approx 5

So the answer for this case would be n=5 rounded up to the nearest integer

6 0
3 years ago
Simplify. (12)2−6(2−23) Enter your answer, as a simplified fraction, in the box.
katen-ka-za [31]

Answer: 240

Step-by-step explanation:

Distribute all numbers

24 - 6(-21)

24 - (-126)

24+216

240

8 0
3 years ago
If T is the midpoint of CE then CT=TE
mr_godi [17]
Answer: true statement
6 0
3 years ago
Please help !!! I’ll mark you as brainliest if correct
Leona [35]

Answer:

0

Step-by-step explanation:

When you multiply any number by 0, the answer is always 0.

3 0
3 years ago
Read 2 more answers
Other questions:
  • The sum of five times a number and 6 is 21. What is the number?
    15·2 answers
  • What is the gcf of 30 and 54
    11·2 answers
  • Express each decimal as a fraction or a mixed number in simplest form. 0.2727272727
    6·1 answer
  • I need the answer to this problem
    15·1 answer
  • Why does everyone keep an eye on Templeton?
    8·1 answer
  • What percent is 5/4 to 3/8?
    11·1 answer
  • The following steps show how the right side of 1 – cos(2x) = tan(x)sin(2x) can be rewritten to show it is an identity.
    6·2 answers
  • I need help with this math problem.
    8·1 answer
  • Vedant runs around a square park of side 42m, three times. Rehan runs around a rectangular park of length 40m and breadth 18m, f
    11·1 answer
  • Write the equation in slope-intercept form.<br><br> 13x + 10y = 4
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!