Question

Find the mean of all positive factors of 18

Answer 1

The positive factors of 18 are : 1, 2, 3, 6, 9 and 18
sum of positive factors = sum of observations = 1 + 2 + 3 + 6 + 9 + 18 = 39
no. of prime factors = 6
no. of observations = 6
$\mathrm{mean}=\frac{\mathrm{sum}\mathrm{of}\mathrm{observations}}{\mathrm{no}.\mathrm{of}\mathrm{observations}}=\frac{39}{6}=6.5$