Given that the standard deviation of x1, X2, X3 is 5, then the variance of data 2x1 + 3, 2x2 + 3, 2x3 + 3 is 5

Given that the standard deviation of x1, X2, X3 is 5, then the variance of data 2x1 + 3, 2x2 + 3, 2x3 + 3 is 5

Let the average of x1, X2, X3 be A1, then: A1 = 1 / 3 (x1 + x2 + x3) S & # 178; = 1 / 3 [(x1-a1) & # 178; + (x2-a1) & # 178; + (x3-a1) & # 178;] = 5 & # 178; = 25 data 2x1 + 3,2x2 + 3,2x3 + 3 the average of A2 = 1 / 3 (2x1 + 3 + 2x2 + 3 + 2x3 + 3) = 2A1 + 3 Variance = 1 / 3 [(2x1 + 3-a2) & # 178; + (2