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STATS HELP PLEASE! VERY URGENT!

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When using normal approximation for a binomial, if the sample size is 85, and the probability of a success is 45%, find the mean and the stardard deviation.

Oct 20th, 2017

The formula for standard deviation is sqrt([sample size][probability of success](1-[probability of success])

sqrt (85*0.45)(1-0.45)= 21.0375

standard deviation=4.58

mean= sample size * success

mean= 85*0.45= 38.25


Apr 23rd, 2015

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