The sum is basically 38 x 77 which is 2926
Chat with our AI personalities
-3 + 4 + (-2) = 1 + (-2) = 1 - 2 = -1.
3
1 1/2 + 1 1/2 = 3
2 and 1 .their sum is 3 .difference is 1
Standard deviation = sqrt(variance) Variance = E[X2] - E[X]2 E[X] = sum(X)/n = 35/9, so E[X]2 = 1225/81 E[X2] = sum(X2)/n = 189/9 = 1701/81 Variance = 476/81 Standard deviation = sqrt(476/81) ~ 2.42