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 0 hours and a standard deviation of 5 5 hours As a part of its quality assurance program, Power , Inc tests samples of 25 batteries a W...

a The distribution will be normal b ...

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

Question:

Power +, Inc. produces AA batteries used in remote-controlled toy cars. The mean life of these batteries follows the normal probability with a mean of 35.0 hours and a standard deviation of 5.5 hours. As a part of its quality assurance program, Power +, Inc. tests samples of 25 batteries.
a. What can you say about the shape of the of the sample mean?
b. What is the standard error of the of the sample mean?
c. What proportion of the samples will have a mean useful life of more than 36 hours?
d. What proportion of the sample will have a mean useful life greater than 34.5 hours?
e. What proportion of the sample will have a mean useful life between 34.5 and 36.0 hours?

Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...