The mean of 20 observations of a series is 18.7 if from each of the observations 3 is substracted and then multiplied by 2 find the mean of the new observations
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Step-by-step explanation:
when a no. is deducted from each observations then
new mean = mean -no.
when a no. is multiplied to each of the observations then its mean is also multiplied by that no.
new mean = mean ×no.
mean, after 3 is deducted = 18.7-3 = 15.7 and
mean, after 3 is deducted and 2 is multiplied
=15.7×2=31.4
hope this helps
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