Kmart brand 60W lightbulbs state on the package "Avg. Life 1000 Hr." Let m denote the true mean life of Kmart 60-W lightbulbs. Then the advertised claim is average life of these bulbs is 1000 hr. People who purchase this brand would be unhappy if average is actually less than the advertised value. Suppose that a sample of 25 Kmart lightbulbs is selected and the lifetime for each bulb in the sample is recorded, where sample mean was 1004 hours and std deviation of 2.2 hours. Is Kmart's claim reasonable for not. Comment if K mart should revise its claim to 900 Hr or not

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