Find the mean, variance and standard deviation of the binomial experiment. In a recent survey, 70% of the community favored building a police substation in their neighborhood. If 30 citizens are chosen, what is the mean number favoring the substation? What would be the variance and standard deviation of their responses?

Mean = 21 , Variance = 6.3 , standard deviation =2.51

Step-by-step explanation:

Formula for the mean, variance and standard deviation of the binomial experiment :

, where n= sample size , p= population proportion.

As per given, p= 70%=0.7 , n=30

Hence, Mean = 21 , Variance = 6.3 , standard deviation =2.51

step-by-step explanation:

hans did not square the 40-unit side; he merely multiplied it by 2.   incorrect.

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step-by-step explanation: