Question

The mean of five numbers is 10. four of the numbers are 4, 6 , 7 and 13. What is the fifth number?

Answer 1

Explanation:

mean=10

mean=
`(a+b+c+d+e)/(5)`

∴10=
`(4+6+7+13+e)/(5)`

∴50=30+e

∴e=50-30

∴e=20

∴the fifth number is 20

Answer 2

The answer is twenty