In a binomial distribution the mean is 15 and variance is 10. Then, parameter n is

Options

A. 28
B. 16
C. 45
D. 25

Answer

C

Explanation

(c ) Given mean, np=15
and variance, np(1-p)=10
`:. " " 1-p=(10)/(15)=(2)/(3) rArr p=(1)/(3)`
`:. " " n=15xx3=45`