Question

find the mean of 1,2,3,............n​

Answer 1

mean=1+2+3/3

=6/3

=2

hope it will help full

Answer 2

Answer:

(n+1) / 2

Step-by-step explanation:

1,2,3.......n form an AP

sum of n terms of an AP = n/2 (2a+ (n-1)d )

a = 1

d = 1

sum = n/2 (2*1 + (n-1)*1)

       = n/2 (2 + n - 1 )

       = n/2 (n+1)

mean = sum of observation / number of observation

         = n/2(n+1) / n

         = (n+1 ) / 2