20vmiller
04.08.2019 •
Mathematics
Consider a binomial experiment with n = 8 trials and p = 0.20. a. find the mean and the standard deviation of the distribution. b. would it be unusual to obtain 5 or more successes
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Ответ:
b. The coefficients for n=8 are: 1, 8, 28, 56, 70, 56, 28, 8, 1.
The first 4 of these are involved in getting 5 or more successes. Let q=1-p. p=0.20 and q=0.80.
So we have p⁸+8p⁷q+28p⁶q²+56p⁵q³=0.0104... This is a very low probability, so it would be unusual to obtain 5 or more successes.
Ответ:
5.553
Step-by-step explanation:
we would subtract 6.75 from 1.197 which in terms would equal 5.553