Question

The mean of the numbers obtained on throwing a die having written 1 on three faces, 2 on two faces and 5 on one face is

(A) 1 (B) 2 (C) 5 (D)

Answer 1

Let X be the random variable representing a number on the die.

The total number of observations is six.

Therefore, the probability distribution is as follows.

X	1	2	5
P(X)

Mean = E(X) =

The correct answer is B.