Question

If two dice are rolled 12 times obtain the mean and variance

Answer 1

Answer:

40/9

Step-by-step explanation:

Given If two dice are rolled 12 times obtain the mean and variance of  the number of success greater than 4

We need to find probability of success and fail

Let x be probability of success and y be probability of fail

So x = 2/6 = 1/3 (since more than 4)

 y = 1 - 1/3 = 2/3

We find mean of success = n x x = 20 x 1/3 = 20/3

variance of success = row^2 = n x y = 20 x 1/3 x 2/3 = 40/9