Question

The mean of n observation is x. If the first item is increased by 1, second by 2, and so on,then the nw meanis a) x+n b) x + n/2 c) x + n+1/2 d) none of these PLEASE EXPLAIN WITH STEPS. I HAVE MY EXAMS ON TUESDAY..PLZZ HELP...

Answer 1

Let x1,x2,...xn are n observations
Mean =(x1+x2+...xn)/n=x----(1)
If new observations are
x1+1,x2+2,...xn+n
New mean =[(x1+1)+(x2+2)+...+(xn+n)]/n
=(x1+x2+...+xn)/n + (1+2+...+n)/n

=x+[n(n+1)/2n]
=x+(n+1)/2
Option C is correct

Answer 2

Answer:

$x + \frac{n + 1}{2}$

Step-by-step explanation:

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