The mean of 15 numbers is 25 .if 4 is subtracted from every number ,what will be the new mean?

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The mean of 10 numbers is 20. If 5 is subtracted from every number, What will be the new mean.

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ANSWER

Mean=20

Total numbers=10

Total sum=200

If 5 is decreased from all numbers

mean subtracting (10×5) from 200 make total sum=200−50=150

New Mean=

10

150

=15

Hence New Mean =15