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The print on the package of100-watt General Electric soft-white light-bulbs says that these bulbs have an average life of750hours. Assume that the lives of all

The print on the package of100-watt General Electric soft-white light-bulbs says that these bulbs have an average life of750hours. Assume that the lives of all such bulbs have a normal distribution with a mean of750hours and a standard deviation of55hours. Find the probability that the mean life of a random sample of25such bulbs will be

a.greater than730hours

Round your answer to four decimal places.

b.between730and745hours

Round your answer to four decimal places.

c.within25hours of the population mean

Round your answer to four decimal places.

d.less than the population mean by at least5hours or more

Round your answer to four decimal places.

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