Question

What is the average of all multiples of 10 from 2 to 198?

• A. 90
• B. 100
• C. 110
• D. 120

Answer 1

The correct option is B 100

There are 19 multiples of 10 from 2 to 198 typically 10, 20, 30 ... 190

Average of these number will be

$=\frac{10+20+30+\cdots +190}{19}=10\frac{[1+2+3+\cdots +19]}{19}=10\frac{[19\times 20]}{19\times 2}=100$