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Probability question about rolling a die several times.

5. A die is rolled 240 times. Find the mean, variance and standard deviation for the number of 3s that will be rolled?  

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For binomial Probability mean = np, variance = np(1-p) and standard deviation = sqrt(variance)

n  =  240  
p = 0.17  
Mean  =  40
Variance  =  33.3333
Stand = 5.7735
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