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