If the average of ten numbers is 16.2 and if 3 is subtracted from each number, then the new average of the ten numbers is:

Correct option is B

Given:

Average of 10  numbers = 16.2

Number subtracted from each number = 3

Formula Used:

Average = $$\frac{Sum\ of\ observations}{Number\ of\ observations}$$​​

Solution:

Total of 10 number =$$10\times 16.2$$​ = 162

If 3 is subtracted from each number:

Then,  new total = 162 - $$3\times10$$ = 132

New average =c$$\frac{132}{10} = 13.2$$​​

Alternate Method:

If number is subtracted from each number then that can directly be subtracted from average:

= 16.2 - 3 =13.2