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math-340:m340-f15-hw:hw-9 [2015/09/15 06:33] – created dcs | math-340:m340-f15-hw:hw-9 [2015/09/20 09:34] (current) – dcs | ||
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- $X$ is the number of heads in four tosses of a fair coin. | - $X$ is the number of heads in four tosses of a fair coin. | ||
- $Y$ is number of aces when two cards are drawn a random from a standard deck of 52 cards. | - $Y$ is number of aces when two cards are drawn a random from a standard deck of 52 cards. | ||
+ | |||
+ | Answers: | ||
+ | |||
+ | - $p_X(x) = \begin{cases}\frac{3}{5},& | ||
+ | - $p_X(x) = \begin{cases}\frac{1}{16},& | ||
+ | - $p_Y(y) = \begin{cases}\frac{188}{221},& | ||
+ |