Find the mean and standard deviation of this random variable

Consider a binomial random variable where the number of trials is 12 and the probability of success on each trial is .25. Find the mean and standard deviation of this random variable
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Let n=12. p=0.25 and q=1-0.25=0.75. The mean is np=3, and the variance is npq=2.25, so the standard deviation is √variance=1.5.

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