Question

Find the mean of all factors of $20$.

Answer 1

Factors of $20=1,2,4,5,10,20$.

No. of factors $=6$

$Mean=\frac{\text{Sum of all factors}}{\text{No. of factors}}$

$Mean=\frac{1+2+4+5+10+20}{6}=\frac{42}{6}=7$