Question

Find the mean of the following data -

x : 10 / 12 / 20 / 25 / 35

f : 3 / 10 / 15 / 7 / 5

Answer 1

x f xf

10. 3. 30

12. 10. 120

20. 15. 300

25. 7. 175

35 5 175


Total of f = 40

Total of xf = 800

mean = total of fx / total of f

mean = 800/40

mean = 20

Answer 2

$mean = \frac{total \: of \: xifi}{total \: of \: fi}$


$mean = \frac{800}{40}$


$mean = 20$