Question

find Mode
Class intervals 10-20/20-30/30-40/40-50/50-60
Frequency 1/6/7/4/2​

Answer 1

Answer:

Class interval. frequency

10-20. 1

20-30. 6

30-40. 7

40-50. 4

50-60. 2

Here maximum frequency is 20, the class corresponding to this 30-40

So the modal class is 30-40

Now lower limit of modal class (l)=30

Frequency (f1) of modal class =7

frequency (f0) of preceding the modal class=6

frequency (f2) of the class succeeding the modal class=4

Class size=10

Mod=l+[ 2f1−f0/f1−f0-f2]×h

according to formula answer is= 340