Find the probability distribution of the random variable X, which denotes the number of doublets in four throws of a pair of dice. Hence, find the mean of the number of doublets (X).
Let X: Number of doublets
X = 0,1,2,3,4
Total number of possible outcomes when we through a pair of dice = 36
Doublets = { (1,1), (2,2), (3,3), (4,4), (5,5), (6,6) }
X | P(X) | X.P(X) |
0 | 0 | |
1 | ||
2 | ||
3 | ||
4 |