The mean of 20 observations is12.5 by error one observation was noted -15 instead of 15 , then the correct mean is
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let the calculated sum be x
x/20 = 12.5
x = 250
orignal sum = x+ 15 - ( -15) = x+ 30 = 280
mean = 280/20 = 14
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x/20 = 12.5
x = 250
orignal sum = x+ 15 - ( -15) = x+ 30 = 280
mean = 280/20 = 14
please follow me
charmishaDr:
once explain me original sum
after removing the wrong observation i.e. -(-15) and adding correct observation i.e. +15 to x
explain original sum pls clearly
How did we get 28
subtract wrong one and add correct one to x
How did you get 280
x is 250
hp how
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