Page No 571:
Question 16:
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) 
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.
