A random variable $X$ follows a binomial distribution $\mathrm { B } ( 200 , p )$ and the mean of $X$ is 40. What is the variance of $X$? [2 points] (1) 32 (2) 33 (3) 34 (4) 35 (5) 36
A random variable $X$ follows a binomial distribution $\mathrm { B } ( 200 , p )$ and the mean of $X$ is 40. What is the variance of $X$? [2 points]\\
(1) 32\\
(2) 33\\
(3) 34\\
(4) 35\\
(5) 36