The mean is the arithmetic average, found by sharing the total equally among all data values.

• To find the mean, add all the values and divide by the number of values.
• The sum is 74, and there are 4 values.
• So the mean is 74 ÷ 4 = 18.5.
• The mean is the balance point of the data.

The correct answer is 18.5. This matches the calculation or definition, so students should focus on the reasoning rather than only memorizing the final value.