Question

Power+, produces AA batteries used in remote-controlled toy
cars. The mean life of these batteries follows the normal
probability distribution with a mean of 22 hours and a standard
deviation of 5.6 hours. As a part of its testing program, Power+
tests samples of 25 batteries. Use Appendix B.1 for the
*z*-values.

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

Shape of the distribution is (Click to select) Normal Uniform Binomial

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

Standard error

**c.** What proportion of the samples will have a
mean useful life of more than 23 hours? **(Round the final
answer to 4 decimal places.)**

Probability

**d.** What proportion of the sample will have a
mean useful life greater than 21.5 hours? **(Round the final
answer to 4 decimal places.)**

Probability

**e.** What proportion of the sample will have a
mean useful life between 21.5 and 23 hours? **(Round the
final answer to 4 decimal places.)**

Probability

Answer #1

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Power+, produces AA batteries used in remote-controlled toy
cars. The mean life of these batteries follows the normal
probability distribution with a mean of 18 hours and a standard
deviation of 5.4 hours. As a part of its testing program, Power+
tests samples of 25 batteries. Use Appendix B.1 for the
z-values.
a. What can you say about the shape of the
distribution of sample mean?
Shape of the distribution is
(Click to
select) Normal Uniform Binomial
b. What is the standard...

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Mattel Corporation produces a remote controlled car that
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