What is the mean? If the answer is a decimal, round it to the nearest tenth.

25

20

24

23

-19

-10

21

To find the mean (average) of a set of numbers, follow these steps:

1. **Add up all the numbers**:  
   \( 25 + 20 + 24 + 23 + (-19) + (-10) + 21 = 84 \)

2. **Count how many numbers there are**:  
   There are 7 numbers.

3. **Divide the sum by the number of numbers**:  
   \( \frac{84}{7} = 12 \)

Thus, the mean is \( 12 \).

Let me know if you'd like more details or have any questions. Here are 5 related questions:

1. How would you calculate the median of this data set?
2. What is the range of these numbers?
3. What is the mode of this data set?
4. How would the mean change if you added another number to the set?
5. How do positive and negative values affect the mean?

**Tip:** The mean is sensitive to extreme values, also known as outliers.

Learn how to find the mean of a data set consisting of the numbers 25, 20, 24, 23, -19, -10, and 21. This example provides a detailed step-by-step solution suitable for students in Grades 6-8. It covers the arithmetic mean concept and explains how to handle positive and negative values.

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