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- December 6th 2009, 01:55 PM #1

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## PmF

A fair coin is tossed four times, and the random variable X is the number of heads in the first three tosses and the random variable Y is the number of heads in the last three tosses.

Find the joint probability mass function and marginal probability mass function of X and Y.

ON this problem, I did HHHH, HHHT, HHTH,....and so on. Is that how you start off and make a table from there. like there is a 1/13 chance of getting first three heads? I am not completely sure.

- December 6th 2009, 07:25 PM #2

- December 8th 2009, 08:55 PM #3

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- December 9th 2009, 04:01 AM #4

- December 9th 2009, 04:11 AM #5

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