Question

The mean of 10 numbers is 20.if 5 is subtracted from every number.what will be the new mean?​

Answer 1

Let the sum of ten numbers be 'x'

Original Mean=20

According to question

Mean=Sum of numbers/Number of numbers

=> 20=x/10

=> 200=x

Now, Modified sum can be found as follows,

Given,

From every number 5 is subtracted,

Therefore

Modified Sum=200-[10*(-5)]

=> Modified Sum=200-50=150

Now, The Modified mean can be counted as follows,

Mean=Modified Sum/Total number of observations

=> Mean=150/10

=> Mean=15

So required Answer----> The modified mean is 15.

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Answer 2

Answer:

$\huge\bf\underline\red{Question}$

The mean of 10 numbers is 20.if 5 is subtracted from every number.what will be the new mean?

$\huge\bf\underline\blue{AnSweR:}$

check the above attachment!

The New mean will be 15.

Hope it will be helpful :)