SOLUTION: Find the arithmetic mean of the terms: an–1 = –4; an+1 = –11.

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Question 1087182: Find the arithmetic mean of the terms: an–1 = –4; an+1 = –11.

Answer by ikleyn(52835)   (Show Source): You can put this solution on YOUR website!
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The arithmetic mean of the terms   = -4  and   = -11  is

 =  = -7.5.

Same as the arithmetic mean of the two numbers -4 and -11.



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