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2015-09-06T13:46:47+08:00

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The formula is:
(82.5 +83.70+88.5+89.9) /4
(166.2 + 88.5 + 89.9) / 4 \\ (254.7 + 89.9) / 4 \\ (344.6/4) \\ =86.15

Meaning that 86.15 or simply 86 is her average. 

Simple solution:
82.5 + 83.70+ 88.5+ 89.9 = 344.6 / 4 = 86.15
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omg I cant really understand it but thanks
You must add all of the numbers, then divide on how many numbers you add. Add it all, meaning 344.6, then simply divide it by 4 = 86.15
oh I get it thanks