In a carnival shell game, a contestant can win a prize by guessing which one of 5 identical walnut shells is covering a small marble.After each guess, the shells are randomly shuffled outside the view of the contestant.If a person plays the carnival game 4 times, what is the probability he or she wins a prize exactly 2 times? 
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Q71: Q72: The mean value of x is: Q73: Q74: Which of the following is not a Q75: Q77: Which of the following rules is the Q78: The proportion of values in a normal Q79: In agricultural states the regulation of insecticide Q80: Suppose that in a certain part of Q81: Given a choice of unbiased statistics, the
A)2.00
B).20
C).36
D)2.16
E)None of
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