If X is the number of 3's that appear when 60 dice are tossed, what is the E(X^2)?

I am not sure how to set this problem up? I am guessing you have to get it into an integral form but I am not sure. Thanks to anyone who can help!

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- October 21st 2011, 06:13 AMacasas4Dice problem (obtaining expected value)
If X is the number of 3's that appear when 60 dice are tossed, what is the E(X^2)?

I am not sure how to set this problem up? I am guessing you have to get it into an integral form but I am not sure. Thanks to anyone who can help! - October 21st 2011, 07:33 AMemakarovRe: Dice problem (obtaining expected value)
X has binomial distribution: . So, .

- October 21st 2011, 11:12 AMCaptainBlackRe: Dice problem (obtaining expected value)