If the mean and the variance of a binomial variate X are 2 and 1 respectively, then the probability that X takes a value greater than or equal to one is :
(1) 9/16
(2) 3/4
(3) 1/16
(4) 15/16
Correct option (4) 15/16
Explanation:
mean = np = 2 ......... (1)
variance npq = 1 ......... (2)
by (2) and (1)
