Chpter7P#095

Please help me solve this problem!!!!!!!!!!!!!!!!!!!!

*Chapter 07, Supplementary Exercises, Problem 095 The print on the package of 100 —watt General Electric soflz-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 740 hours Round your answer to four decimal places. :u b. between 735 and 740 hours Round your answer to four decimal places. *2 c. within 15 hours of the population mean Round your answer to four decimal places. *3 d. less than the population mean by at least 25 hours or more Round your answer to four decimal places. *4