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Calculating probability for the sample mean will be less than 27.5 hours.
A certain long-life battery has an average life of 28 hours and standard deviation of 2.2 hours. For a random sample of 50 batteries, what is the probability that the sample mean will be less than 27.5 hours?
(1) 0.0399
(2) 0.0668
(3) 0.0339
(4) 0.0539
(5) 0.049
What is the expected shape of the distribution of the sample mean?
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