What is the mean of this set of numbers? 7, –9, 6, –10, –13, –5 a. 7.7 b. –4 c. 4 d. –24

To find the mean you need to add all the numbers together then divide by how many numbers there were in the first place. 
So 7+ –9+ 6+ –10+ –13+ –5=-24
Now we have to divide this by how many numbers there were, and there were 6 so -24/6=-4
So your answer is going to be, B)-4