#!/bin/awk -f
BEGIN { n = 0; s = 0; ss = 0;}
NF == 1 { n++; s += $1; ss += $1 * $1; }
END {
 m = (s+0.0) / n; printf "%.2f\n", m 
 sd = sqrt( (ss - n * m * m) / ( n - 1.0))
 printf "%.2f\n", sd
}