A die is rolled 360 times. Find the standard deviation for the number of 3s that will be rolled.?
A die is rolled 360 times. What is the standard deviation of the number of times a 3 will be rolled?
2 Answers
This is modelled by the binomial distribution B(360, 1/6). The variance of B(n, p) is np(1–p). So your answer is sqrt(360 × 1/6 × 5/6) = 7.071.
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