The chance of success on a trial of a binomial experiment is known to be 0.9. The random variable x, number of successes, has a mean of 96.?
2017-07-14 12:26 pm
find: A.The number of involved in this experiment. B.Find the standard deviation of x.
回答 (1)
2017-07-14 3:49 pm
✔ 最佳答案
E X = np = 96Var X = np( 1 - p ) = 96*( 1 - 0.9 ) = 9.6
σ = √( Var X ) = √9.6 ..... Ans
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