Question

the mean of 15 term is 42. if 7 is subtracted from every term then find new mean​

Answer 1

Answer:

If mean of 15 term is 42 and when 7 is subtracted from every term then the new mean is 35

Step-by-step explanation:

Given mean of 15 numbers is 42 .

Mean of 15 numbers = sum of all numbers divided by 15

Let x be the sum of all 15 numbers .

Then mean of the given 15 numbers = $\frac{x}{15} \\ = 42$

Therefore x= 42× 15 = 630

If 7 substracted from each term ,

Then sum of all numbers = x-(15×7)

= 630- 105

=525

So the new mean = sum of all numbers / 15

= 525/15

= 35