Here his a link to how you solve this , please do not use it to cheat but to learn from it
http://ecsd-fl.schoolloop.com/file/1298972684338/1298972684200/3666926465936506857.pdf
Hope this helps !<span />
Answer:
-7 + 4 = -3
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Set them up from least to greatest..
The mean is the average of all the data so..
The answer is 2.7