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2015-01-06T23:52:07+05:30

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Sum of 15 observation = mean * no of terms = 28*15 = 420. Now sum of 1st 8 observation = mean * no of terms = 25* 8 = 200 Now sum of last eight observation = mean * no of observation = 30* 8 = 240 now Eight term = sum of 1st eight observation + sum of last eight observation - sum of all observation = 200+240 - 420 = 20
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