Find the sum of the squares of first five natural numbers.

explanation

1²=1. 2²=4. 3²=9. 4²=16. 5²=25

1+4+9+16+25

answer

55

The first five natural numbers are 1,2,3,4,5. Since mean = sum of all the numbers / total numbers. Here, the sum of all the numbers = 1+2+3+4+5 = 15 and total numbers = 5 (since we are talking about the mean of 5 natural numbers). Therefore, mean = 15/5 = 3.