18. The mean is defined as the
A. range of the data set.
B. average of a data set.
C. middle of the data set.
D. number that shows up most often in a data set.
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The average
The answer is B. average of a data set. The mean is calculated by adding up all the numbers in a data set and then dividing the sum by the total number of values. To find the mean of a data set, follow these steps:
1. Add up all the numbers in the data set.
2. Count the total number of values in the data set.
3. Divide the sum of the numbers by the total number of values.
4. The result is the mean of the data set.