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Last updated at May 29, 2018 by Teachoo
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Ex 15.2, 6 Find the mean and standard deviation using short-cut method. Mean = a + (โโ๐๐๐ฆ๐)/(โโ๐๐) ร h = 64 + 0/100 ร1 = 64 Standard Deviation = โ/๐ โ(๐โโ๐๐๐ฆ๐2 โ (โโ๐๐๐ฆ๐)^2 ) "= " 1/100 โ("100" ร"286 โ " ใ(0)ใ^2 ) = 1/100 โ28600 = 169.1/100 = 1.691
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