**Total** is the sum of
the measured quantity for the items.

**Mean** is the
Total divided by the number of items, also know as
the average.

**Median** is the number
in the middle when the data is arranged in increasing order.

**Mode** is the number
that appears most frequently in the data.

**Range** is the
difference between the largest number and the smallest number in the data.

**Variance** describes
how far the data is from the mean or, in other words, how well the mean
represents the data. The variance is calculated by first subtracting the value
of each item from the mean and squaring each result individually. Then, all the
squared terms are added together and the total is divided by one less than the
total number of items (or squared terms).

**Deviation** is the
average distance of each item from the line that best fits the data. This value
is calculated by taking the square root of the Variance
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