Question: The package of Sylvania CFL 65 watt replacement bulbs that use
The package of Sylvania CFL 65-watt replacement bulbs that use only 16 watts claims that these bulbs have an average life of 8000 hours. Assume that the lives of all such bulbs have a normal distribution with a mean of 8000 hours and a standard deviation of 400 hours. Let be the average life of 25 randomly selected such bulbs. Find the mean and standard deviation of , and comment on the shape of its sampling distribution.
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