The print on the package of 100-watt General Electric soft-white light-bulbs says that these bulbs have an average life of 750 hours. Assume that the lives of all such bulbs have a normal distribution with a mean of 750 hours and a standard deviation of 55 hours. Find the probability that the mean life of a random sample of 25 such bulbs will be a. greater than 725 hours. Round your answer to four decimal places. b. between 735 and 745 hours. Round your answer to four decimal places. C. within 5 hours of the population mean.

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