Question

the mean of N - observation is x if a is added to each of the nation then the new mean is​

Answer 1

Answer:

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Answer 2

Answer:

mean of observation 'n' = x

hence the sum of 'n' observations = nx

if the first term increased by 1 , second by 2 and so on then sum of natural numbers from 1 to n is added

sum = (n(2)(1+n)

hence new sum = nx+(n/2)(1+n)/2

new mean ={nx+(n/2)(1+n)/n} = x+(1+n)/2

I hope this helps u