## anonymous one year ago What is the mean of the set of numbers? {–9, –8, 4, –1} A. –5.5 B. –3.5 C. –2.8 D. 14 Question Resources

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1. SolomonZelman

The mean (or the average), is found by adding all the numbers in the set, and dividing by the number of these numbers.

2. SolomonZelman

In your case: $$\mu =\dfrac{(-9)+(-8)+(4)+(-1)}{4}$$ where $$\mu$$ denotes the mean.

3. anonymous

4. SolomonZelman

What is the sum of all elements in your set, can you find that for me?

5. SolomonZelman

(-9) + (-8) + (4) + (-1) = ?

6. anonymous

-14

7. SolomonZelman

yes, that is right.

8. anonymous

9. SolomonZelman

Now, lets get back to finding the $$\mu$$ (the mean). $$\mu =\dfrac{(-9)+(-8)+(4)+(-1)}{4}=\dfrac{-14}{4}=?$$

10. anonymous

-3.5

11. SolomonZelman

Yes, and this is exactly right!

12. anonymous

so that is the final answer

13. SolomonZelman

yes

14. anonymous

thank you so much

15. SolomonZelman

You are welcome!