A set of data consists of the following numbers: 12, 15, 18,...

Question Analysis
This question tests the student's ability to calculate the mean of a given data set. The mean is the sum of all the data points divided by the number of data points.

Key Concept Explanation
The mean is a measure of central tendency that represents the average value of a data set. It is calculated by summing all the data points and dividing by the number of data points.

Step-by-step Solution
1. Sum the data points:

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Algebra-1

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