Posted by **mike** on Friday, July 22, 2011 at 8:31pm.

Two dice are rolled and two fair coins are tossed. Let X be the sum of the number of spots that show on the top faces of the dice and the number of coins that land heads up. The expected value of X is _____ .

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**bobpursley**, Friday, July 22, 2011 at 9:02pm
Well, the die are independent.

expected dots from one die:1/6(1+2+3+4+5+6)=21/6

expected sum:= 42/6=7

expected number of heads: 1/2 * 2

expected value of X is 8

- statistics -
**Bruno**, Tuesday, June 5, 2012 at 7:47pm
A lottery offers one $900 prize, one $600 prize, three $400 prizes, and five $100 prizes. One thousand tickets are sold at $6 each. Find the expectation of a person buys five tickets.

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