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 observation. i need a step by step explanation with complete answer... :)​

Answer 1

Answer:

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

Step-by-step explanation:

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