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?
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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 can approximate this to normal distribution.
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