Question: Calculate the variance and standard deviation for samples for which a. n = 10 , x2 = 84, x = 20 b. n = 40,

Calculate the variance and standard deviation for samples for which
a. n = 10 , ∑x2 = 84, ∑x = 20
b. n = 40, ∑x2 = 380, ∑x = 100
c. n = 20, ∑x2 = 18, ∑x = 17

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