“平均数”造句

取120个值计算平均数。
Take a hundred and twenty values and calculate the mean.

把它们相加再除以5就是平均数，明白吗？
Add them together, divide by five, and you've got the average. Okay?

在新英格兰人们的收入通常比全国平均数低10%.
Income in New England is commonly 10 % below the national average.