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find out the probability that 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 would be less than 27.5 hours?

(1) 0.0399

(2) 0.0668

(3) 0.0339

(4) 0.0539

(5) 0.049

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
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