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A population of eight students has the ages given X 19 20 21 27 P(X=x) 0.25 0.375 0.25 0.125 Find the mean and standard deviation

A population of eight students has the ages given

X 19 20 21 27

P(X=x) 0.25 0.375 0.25 0.125

Find the mean and standard deviation of the random variable.

Please show all of your work I am very confused

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