Asked by kirsten
A fair six sided dice has the faces numbered from 1 to 6. The dice is thrown 4 time. Calculate the probability of exactly 2 fives. the answer is 25/216
Answers
Answered by
Reiny
prob(5) = 1/6
prob(not 5) = 5/6
you want 5 twice, not5 2 twice
prob = C(4,2) (1/6)^2 (5/6)^2
= 6(1/36)(25/36) = 25/216
prob(not 5) = 5/6
you want 5 twice, not5 2 twice
prob = C(4,2) (1/6)^2 (5/6)^2
= 6(1/36)(25/36) = 25/216
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