if the mean of 25 observations is 27 and each observation is decreased by 7 what will be the new mean
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here is your answer mate
Step-by-step explanation:
Mean = sum of the quantity of observations/ frequency
Hence sum of observations = frequency x mean
The total sum = 25 x 27
= 675
if each observation is decreased by 7, then total decrease = 25 x 7
=175
minus 175 from the first total sum to find the new total sum of the observation = 675 - 175
= 500
Hence the new total = 500
The new mean will be = total / frequency
= 500/25
= 20
new mean is 20
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