Question

Find the mean of the following distribution:

x

4

6

9

10

15

y

5

10

10

7

8

       

Answer 1

x = 20 + 60 + 90 + 70 + 120 = 360
f   = 5 + 10 + 10 + 7 + 8 = 40
Therefore mean = 360/40
                        =9