Final answer:
The mean of the numbers 18, 28, 24, 25, and 15 is calculated by adding them together and then dividing by the number of values, resulting in 22.
Step-by-step explanation:
The mean, or average, of a set of numbers is calculated by adding all the numbers together and then dividing by the count of the numbers. To find the mean of the numbers 18, 28, 24, 25, and 15, we first add them: 18 + 28 + 24 + 25 + 15 = 110. Then, we divide this sum by the number of values, which in this case is 5. So we have 110 ÷ 5 = 22. Therefore, the mean of these numbers is 22. The correct answer is C) 22.