Question

15) Find the mean of the following data :
Marks 18 20 10 15 7
Frequency 8 6 3 9 5
​

Answer 1

Answer:

Marks mean =14

frequency mean=6.5

Step-by-step explanation:

18+20+10+15+7/5=14

8+6+3+9+5/5=6.5

Answer 2

Answer:

14.967

Step-by-step explanation:

Mean = ∑f x / ∑f

Mean =  ($\frac{18 * 8 + 20 * 6 + 10 * 3+ 15 * 9 + 7 * 5}{8+6+3+9+5}$)

          = (144 + 120 + 30+ 135 + 35) / 31

          = 464 / 31

          =  14.967