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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

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M9173280

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