Question

The mean of a set of 10 numbers is 20 Is each number is first multiples by 2 and then increased by 5 then what is the mean of new numbers?

• A. 20
• B. 25
• C. 40
• D. 45

Answer 1

The correct option is D 45

Given the mean of 10 numbers is 20

Then total of numbers=$20\times 10$ =200

If each number multiples by 2 and add 5

Then total of new numbers =$20\times 2\times 10+5\times 10=450$

So mean =$\frac{450}{10}=45$