Psmith, the TeX bot, in fixed font mode:
{640, 231, 100, 91}
640+231+100+91 = 1062
mean | 265.5
median | 165.5
sample standard deviation | 257.7
sqrt(481242)~~693.716
(320 sqrt(2/240621), 77 sqrt(3/160414), 50 sqrt(2/240621), 91/sqrt(481242))
OEIS A027885
640, 231, 100, 91, 1003, ...