Question

If mean of n observations is x. If the first observation is increased by 2,the second by 4,the third by 6 so on, find the mean of new observations.

Answer 1

Answer:new mean(x1)=old mean (x) + n/2 (2a+(n-1)d) / n where a and d is 2

Step-by-step explanation:

For ex

2+ 4 + 6 /3 = 4

And

4 + 8 + 12 /3 = 8

By applying the formula u will get the ans 8 too

N=3

X=4

A=2

D=2

So,

By formula

4+ 3/2 (4+2×2)

=4+ 4

=8

Hope this may help u..