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  3. 4 fair coins are tossed. let x be the number of he

4 fair coins are tossed. Let X be the number of heads and Y be the...

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Question

Statistics

4 fair coins are tossed. Let X be the number of heads and Y bethe number of tails. Find Var(X-Y)

Solution: 3.5

Why?

Answer & Explanation Solved by verified expert
4.5 Ratings (897 Votes)
Z X Y can take values 4 2 0 2 4 For Z 4 X 0 Y 4 PX0Y4 Probability of getting 4 Tails 124 00625 For Z 2 X 1    See Answer
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