# Statistics What is expected value for this situation: # of 4's and 5's we would get in 25 rolls of a dice. b) Would this be a normal approximation?

### 1 Answer | Add Yours

The probability of getting a 4 or 5 is `p = 1/6 + 1/6 = 1/3`

The number of dice rolls is `n = 25`

The mean or expected value `= np = 25 xx 1/3 = 25/3`

`np gt 5`

Therefore we canĀ approximate this to normal distribution.