Question

please answer this question ​

Answer 1

Answer:

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Answer 2

New mean of the data is 20

Answer:

Given:-

Mean of 25 observations is 27

To find:-

Find the new mean when each observation is decreased by 7

Using formula:-

Mean= Sum of observations/ No. of observations

Solution:-

Number of observations=25

Mean of observations=27

Mean= Sum of observations/ No. of observations

=>27=Sum of observations/25

=>Sum of observations=27×25=675

If each observations is decreased by 7 then total value decreasing is 25×7=175

Sum of new observations=675-175=500

new Mean of the new data

=> Sum of observations/ No. of observations

=>500/25

=>20

Answer:-

New mean of the data is 20

Conclusion:-

If the mean of the dat is X of n observations then each observations is decreased by a then the new mean is X-a