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1.A company produces AA batteries used in remote-control cars.The mean life of these batteries follows the normal probability distribution with a mean of 35 hours

1.A company produces AA batteries used in remote-control cars.The mean life of these batteries follows the normal probability distribution with a mean of 35 hours and a standard deviation of 5.5 hours.As part of its quality assurance program, it tests samples of 25 batteries.

a.What proportion of the samples will have a mean useful life of more than 37 hours?

b.What proportion of the samples will have a mean useful life greater than 33.5 hours?

c.What proportion of the samples will have a mean useful life between 34 and 36.5 hours?

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