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Statistics What is expected value for this situation: # of 4's and 5's we would get in...

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juno60 | Salutatorian

Posted June 18, 2012 at 11:06 AM via web

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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?

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thilina-g | College Teacher | (Level 1) Educator

Posted June 18, 2012 at 2:59 PM (Answer #1)

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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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