What is the process for calculating the mean (the average) of a set of data?
A. Finding the middle point in a set of numbers 1, 3, 6, 9, 10, 11, 15 = 9
B. Finding the most frequently occurring number 00, 22, 44, 555 = 5
C. Adding all of the numbers together within a data set then dividing by the number of items within the set: 30 + 20 + 10 + 20 + 10 = 90; then 90 ÷5 = 18
D. Applying the following calculation to find out the average: given amount ÷ total amount × 100
Answer: C
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