Question

(a) find the mean of the sqauares of the first five natural numbers.
(b) find the mean of thr cubes of first 4 odd prime numbers.

Answer 1

first five natural numbers are
1, 2 , 3 , 4 , 5

so, square of these numbers are
1, 4 , 9, 16 , 25

now ,
mean = sum of square of numbers /total number = (1 + 4 + 9 +16 +25)/5
=55/5 = 11




(b) first 4 odd prime numbers are
1 , 3 , 5 , 7,

so, cubes of these numbers are
1 , 9, 25 , 49

mean = ( 1+ 9 + 25 + 49)/4
= 84/4 = 21