The arithmetic mean is found by dividing the sum of all data values by the number of values; it represents the equal share each observation would receive if the total were redistributed evenly and serves as a balance point for the data set. The mean can be calculated and interpreted for data involving whole numbers, decimals, or simple fractions, and an extreme value can change it substantially; weighted means and advanced statistical inference are beyond this scope.
The mean is the equal-share value of a data set.
To find it:
A student reads for these numbers of minutes over 5 days:
Step 1: Add the values.
Step 2: Count the values.
There are numbers.
Step 3: Divide the sum by the number of values.
The mean is 20 minutes.
This means that if the total reading time, minutes, were shared equally across the 5 days, each day would have minutes.
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