The mean of first n odd natural number is
We know that mean or average of observations, is the sum of the values of all the observations divided by the total number of observations.
and, we have first n odd natural numbers as
1, 3, …, 2n - 1
Clearly the above series is an AP(Arithmetic progression) with
first term, a = 1 and
common difference, d = 2
And no of terms is clearly n.
And last term is (2n - 1)
We know, sum of terms of an AP if first and last terms are known is:
Putting the values in above equation we have sum of series i.e.
…[1]
As,
Mean
⇒ Mean