Objective: I know how to calculate the mean of a set of numbers.

In statistics, the mean of a set of observations is the average.

It is obtained by dividing the sum of data by the number of observations.

Read the lesson on mean for more information and examples.

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

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