Question

15) Find the
find mean of the following
distribution
class interval frequency
3-5 5
5_7 10
7_9 10
9_11 7
11_13 8

​

Answer 1

Answer:

C.I F

i

x

i

x

i

F

i

3−5

5−7

7−9

9−11

11−13 5

10

10

7

8 4

6

8

10

12 20

60

80

70

96

∑F

i

=40 326

Mean =

∑F

i

∑x

i

F

i

=

40

326

=8.15

Mean =8.15