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Random Variables and Discrete Probability Distributions

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How many Heads should we expect<br />

if we toss two fair coins?<br />

• Next, we count the outcomes.<br />

�� The outcome two Heads, HH, occurs<br />

once.<br />

�� The outcome one Head, HT <strong>and</strong> TH,<br />

occurs twice.<br />

�� The outcome zero Heads, TT, occurs<br />

once.

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