Average of 8 numbers is 21.
If each number is multiplied by 8 then the average will also get eight times.
Therefore average is 21×8=168.
Explination:
Let eight numbers be x1 ,x2 ,x3, …….. x8.
To take average we add all numbers an divide by the total numbers we have
So avg is
(x1 + x2+x3+………..x8)÷8=21
Now all numbers are multiplied by eight
So eight we will be taking as common
Therefore average is
8 (x1+ x2+ x3………..x8)÷8
Now we know (x1+ x2+ x3………x8)÷8= 21
So it becomes
8×21
Which is equal to 168.
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