A die is thrown thrice. A success is 1 or 6 in a throw. Find the mean and variance of the number of successes.

Explanation

Here,` n=3`

`p=` probability of getting `1 or 6=frac{1}{3}`
and` {q}=1-frac{1}{3}=frac{2}{3}`

Mean `={np}=1`

Variance` ={npq}=frac{2}{3}`