Question

Mean of five observations is 22 .if each observation is increased by five what will be the new mean class 7

Answer 1

Total of  five observation = 5×22=110

Let first observation = A

S5 = 5/2 ( 2A+ (5-1)×5

====5/2 × (2A +20)

=====5A+10

We have S5 = 110

                5A+10= 110

                 5A=100

                  A=20

Every observation is increasing by 5

So next observation will be 6th term

20 +(6-1)×5

= 20 +25

=45

Answer -.  45.