GRE

简答题In college basketball．a player awarded a “one-and-one” gets to shoot one free throw and，if successful，shoot a second one．Each successful free throw is worth one point．Suppose a player succeeds at free throws 80%of the time．On average，how many points should thisplayer expect to score for each one-and-0ne?

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D．
The player might earn one point by making the first shot(80%chance) and failing the second(20%chance)．The likelihood of this is 0．8×0．2=0．16．The player might also earn two points by making both shots．with a likelihood of 0．8 × 0．8=0．64．The average expected number of points per one．and．one awarded is thus 0．16×1+0．64×2=1．44．

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