Question

The sum of deviations of "n' observations from 25 is 25 and sum of deviations of the same
'n' observations from 35 is - 25. Find the mean of the observations.​

Answer 1

Answer:

30

Step-by-step explanation:

Given

n

∑(x−25)

=25 and

n

∑(x−35)

=−25

⇒

n

∑x−∑25

=25 and

n

∑x−∑35

=−25

⇒

n

∑x−25n

=25 and

n

∑x−35n

=−25

Adding these two equation 2∑x=60n. Hence mean

n

∑x

=30