Question

the average of 15 numbers in 25. If 4 is Subtracted from
every number what will be new average ?

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Answer 1

Step-by-step explanation:

average= sum of no.s / total no. of values

sum of no.s = average × total no. of values

= 15 × 25

= 375

now 4 is subtracted so

average = x

sum = 371

total no. of values = 14

x = 371/14

x = 26.5

hope the answer is correct

Answer 2

Answer:

First we have to calculate the sum (x) of the original numbers as shown below:

mean = sum (x)/15 numbers

25 = x/15

x = 375

So, the sum of all 15 numbers was 375.

Now, in removing 4 from each of the 15 numbers, we can determine how much the total number will be.

15 x 4 = 60

Remove this from the previous total:

337-60= 315

Now, we have a new total (315) with the same amount of numbers (15), so we can determine a new average as:

Mean = sum/numbers

mean = 315/15

mean = 21