Answers

2016-02-19T18:57:13+05:30

we know that (very import formula in IIT)
when we divide , multiply substrate and add from average the mean also gets increased by that number
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2016-02-19T19:22:55+05:30
Mean of 5 no=27
27*5=135

mean of 6no=25
6*25=150

exclude no is 150-135=15
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