gordon tosses a fair die four times. What is the probability that he will toss exactly two 5s

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Originally Posted by coira94

gordon tosses a fair die four times. what is the probability that he will toss exactly two 5s

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If the probability of something occurring is p, then the probability of it not occurring is (1-p), and the probability of it occurring k times out of n tries is:

Prob (k occurrences in n tries) =

For this problem do you know what the values for p, n and k are? Post back with what you get for an answer and we'll check it for you.