Question

In 5 throws of a die, getting 1 or 2 is a success. The mean number of success is …

(a) 5/3

(b) 3/5

(c) 5/9

(d) 9/5

Answer 1

(a) 5/3

Given, n = 5

Getting 1 or 2 is a success p = 2/6 = 1/3

mean = np = 5 x (1/3) = 5/3