en.wikipedia.org/wiki/Number

A number is a mathematical object used to count, measure, and label. The original examples .... Here the letter Z comes from German Zahl, meaning ' number'.

www.mathsisfun.com/mean.html

The mean is the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are. In other words it is the sum ...

www.purplemath.com/modules/meanmode.htm

Explains how to compute the mean, median, mode, and range of a list of numbers.

www.khanacademy.org/math/probability/data-distributions-a1/summarizing-center-distributions/v/mean-median-and-mode

Here we give you a set of numbers and then ask you to find the mean, median, and mode. It's your first opportunity to practice with us!

www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/cc-6-mad/v/mean-absolute-deviation

Mean absolute deviation (MAD) of a data set is the average distance between each data ... https://www.khanacademy.org/math/probability/descriptive-statistics/ ...

www.khanacademy.org/math/probability/data-distributions-a1/summarizing-center-distributions/v/using-mean-to-find-missing-value

You would then, take the mean, multiply that by the number of entries. .... trouble finding means, watch this video: https://www.khanacademy.org/math/probability/ ...

www.wyzant.com/resources/lessons/math/elementary_math/mean_median_and_mode

Finding the mean, also known as averaging numbers, is a very useful thing to know ... Amy's math grades are: 99, 89, 94, 85, 79, 83, 95, 93, 100, 94, 80, 100.

www.ducksters.com/kidsmath/mean_median_mode_range.php

Mean - When people say "average" they usually are talking about the mean. You can figure out the mean by adding up all the numbers in the data and then ...

www.freemathhelp.com/arithmetic-mean.html

The simplest formula for a mean is the following: Add up all the numbers you want to average, and then divide by the number of items you just added.