Question

39) The mean of five numbers is 30. A sixth number is
added. The new mean of six numbers is found to be 31.
The sixth number is:​

Answer 1

Answer:

30,31,32,33,34,35,36,37

Answer 2

Given:

The mean of five numbers = 30

The new mean of six numbers when a sixth number is added = 31

To find:

The value of sixth number.

Solution:

The mean of certain numbers = Sum of numbers/ Total number of numbers

Therefore sum of five numbers = 30*5 = 150

Let the sixth number be x.

Therefore (150+x)/ 6 = 31

150 + x = 186

x = 31

Therefore the value of sixth number will be 31.