[stylist] Comma rules

[Chris Kuell]

Hi Eve,

An average and a mean are similar, but different. Averages are not taken 
from means. The average temp for May is when you take the highest 
temperature for each day, every day. You then add those temps up and divide 
by 31, and you'll get the average daily high temperature. The mean is when 
you look at those 31 temps, and divide the pile in 2, with half being below 
a point, and half being above it. That point is the mean. Sometimes the mean 
turns out to equal the average, but often it doesn't.

I hope my explanation makes sense. Math makes more sense to me than commas.

chris