SOLUTION: Assume that a procedure yields a binomial distribution with n trials and the probability of success for one trial is p. Use the given values of n and p to find the mean u and stan

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Question 1058376: Assume that a procedure yields a binomial distribution with n trials and the probability of success for one trial is p. Use the given values of n and p to find the mean u and standard deviation o. Also, use the range rule of thumb to find the minimum usual value u - 2o and the maximum usual value u + 2o.
In an analysis of preliminary test results from a gender-selection method, 19 babies are born and it is assumed that 50% of babies are girls, so n = 19 and p = 0.5.
The value of the mean is u= 9.5 (Simplify your answer)
The value of the standard deviation is o= 2.2. (Round to one decimal place as needed)
The minimum usual value is u - 2o= 5.1 (Round to one decimal place as needed)
The maximum usual value is u + 2o= 13.9 (Round to one decimal place as needed)


Found 2 solutions by Boreal, Fombitz:
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
Using np for the mean, that is correct
using np(1-p) for the variance, the sd is sqrt (4.75) or 2.18 or 2.2
5.1,13.9 is the interval.
All looks good.

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Yes, looks good.