Question

$\huge{QUESTION }$


The mean of 20 observations is 17. If observations 40 is changed to 12 , what will be the value of the new mean.

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Answer 1

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Answer 2

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Since 17 is the mean of 20 observations

sum of 20 observations =17×20

= 340

New sum of 20 observations =340-40+12

New mean =312/20

= 15.6

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