Question

Find the mean of following data: 1 square, 2 square ,3 square ,........20 square

Answer 1

Hi mate here is your answer

the numbers are arranged in increasing order

1,2,3,4,5,..........20

its total sum

---------------------

20

210

-------

20

=10.5 it is a mean

Answer 2

1,4,9....400

a= 1 d= 4-1=3 an=400

applying an = a+ (n-1)d

I think it helps you