standard deviation from frequency table

Dear friends: Does anyone know / remember how to obtain the standard deviation of a set of numbers given only a frequency table? e.g., xf(x) 00.2 10.3 20.2 30.2 40.1 Many thanks. Chris = Instructions

Simulating Integer Scores

Hello: Does anyone happen to know of a way to generate integers that have a normal distribution or a distribution close to a normal distribution? I am trying to generate some whole-numbers with a given range, mean, and standard deviation. For example, I was wondering if one could simulate,