Sample space, probability mass functions, expected value help??

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$Old$ September 27th, 2009, 11:49 AM

Intsecxtanx $Intsecxtanx is offline$

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$Question$ Sample space, probability mass functions, expected value help??

There are 10 chips in a bag: 4 have the number 1 written on them, 2 the number 2, and 4 the number 3. Suppose each chip is drawn with the same probability. Let X be the number on the chip that is selected.
1. Find the sample space of X
2. Find the p.m.f. (probability mass function) of X
3. Compute E [X] (expected value)
4. Compute Var [X] (Variance)

Please help? I will forever thank you. this is all so confusing to me.

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expected value, probability mass function, variance

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