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SOLVED:The package of Ecosmart Led 75 -watt replacement bulbs that use only 14 watts claims that these bulbs have an average life of 24,966 hours. Assume that the lives of all such bulbs have an approximate normal distribution with a mean of 24,966 hours and a standard deviation of 2000 hours. Let x̅ be the average life of 25 randomly selected such bulbs. Find the mean and standard deviation of x̅, and comment on the shape of its sampling distribution.

SOLVED:The package of Ecosmart Led 75-watt replacement bulbs that use only 14 watts claims that these bulbs have an average life of 24,966 hours. Assume that the lives of all such bulbs have an approximate normal distribution with a mean of 24,966 hours and a standard deviation of 2000 hours. Find the probability that the mean life of a random sample of 25 such bulbs is a. less than 24,400 hours b. between 24,300 and 24,700 hours c. within 650 hours of the population mean d. less than the popula

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