Question 456894
{{{mu = E(X) = (600 + 470 + 170 + 430 + 300)/5 = 1970/5 = 394}}}

==> {{{Var(X) = sigma^2 = ((600 - 394)^2 + (470  -394)^2 + (170 - 394)^2 + (430 - 394)^2 + (300 - 394)^2)/5 = (42436 + 5776 + 50176 + 1296 + 8836)/5 = 108520/5 = 21704}}}