A random variable X has binomial distribution with n = 10 and p = 0.3 then variance of X is:_____________________?

A random variable X has binomial distribution with n = 10 and p = 0.3

1.	A random variable X has binomial distribution with n = 10 and p = 0.3 then variance of X is:_____________________?
A.	10
B.	12
C.	2.1
D.	21
E.	None
Answer» D. 21