Mathematics, 25.04.2020 16:14 paigeyadon13

Power +, Inc. produces AA batteries used in remote-controlled toy cars. The mean life of these batteries follows the normal probability distribution with a mean of 35 hours and a standard deviation of 5.2 hours. As a part of its quality assurance program, Power +, Inc. tests samples of 25 batteries.

What can you say about the shape of the distribution of the sample mean?

What is the standard error of the distribution of the sample mean? (Round your answer to 4 decimal places.)

What proportion of the samples will have a mean useful life of more than 36 hours? (Round your z value to 2 decimal places and final answer to 4 decimal places.)

What proportion of the sample will have a mean useful life greater than 34.5 hours? (Round your z value to 2 decimal places and final answer to 4 decimal places.)

What proportion of the sample will have a mean useful life between 34.5 and 36 hours? (Round your z value to 2 decimal places and final answer to 4 decimal places.)

Answers: 3

Show answers

Another question on Mathematics

Mathematics, 21.06.2019 16:30

Why do interests rates on loans to be lower in a weak economy than in a strong one

Answers: 2

Answer

Mathematics, 21.06.2019 18:40

Dexter read 11 science fiction books and 5 history books. lena read 9 science fiction books and 4 history books. compare the students’ ratios of science fiction books to history books. 1. determine the ratios’ form: science fiction books to history books 2. write the ratios as fractions: dexter: 115; lena: 94 3. rewrite with a common denominator. 4. compare. 5. answer the question. determine which shows the correct comparison of the ratios for this problem.

Answers: 1

Answer

Mathematics, 21.06.2019 19:30

Which statements are true? check all that apply. the line x = 0 is perpendicular to the line y = –3. all lines that are parallel to the y-axis are vertical lines. all lines that are perpendicular to the x-axis have a slope of 0. the equation of the line parallel to the x-axis that passes through the point (2, –6) is x = 2. the equation of the line perpendicular to the y-axis that passes through the point (–5, 1) is y = 1.

Answers: 1

Answer

Mathematics, 21.06.2019 19:40

It appears that people who are mildly obese are less active than leaner people. one study looked at the average number of minutes per day that people spend standing or walking. among mildly obese people, the mean number of minutes of daily activity (standing or walking) is approximately normally distributed with mean 376 minutes and standard deviation 64 minutes. the mean number of minutes of daily activity for lean people is approximately normally distributed with mean 528 minutes and standard deviation 107 minutes. a researcher records the minutes of activity for an srs of 7 mildly obese people and an srs of 7 lean people. use z-scores rounded to two decimal places to answer the following: what is the probability (image for it appears that people who are mildly obese are less active than leaner people. one study looked at the averag0.0001) that the mean number of minutes of daily activity of the 6 mildly obese people exceeds 420 minutes? what is the probability (image for it appears that people who are mildly obese are less active than leaner people. one study looked at the averag0.0001) that the mean number of minutes of daily activity of the 6 lean people exceeds 420 minutes?

Answers: 1

Answer

You know the right answer?

Power +, Inc. produces AA batteries used in remote-controlled toy cars. The mean life of these batte...

Questions