The ages of 40 patients who visited a dentist on a particular day are as
follows
41, 36, 11, 21, 19, 35, 45, 9, 15, 19, 11, 35, 36, 41, 43, 38, 40, 30, 21, 19, 9,
32, 25, 42, 28, 16, 8, 13, 19, 35, 37, 25, 23, 59, 33, 18, 28, 30, 39, 48
Prepare a grouped frequency table with one interval as 30 – 40 ?
Answers
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1
Answer:
Class Interval
Frequency
10-20
20-30
30-40
40-50
50-60
60-70
10
12
7
7
8
3
(i) For Cumulative Frequency 30−40 frequency is 7
(ii) Size is 11
Mid point for cumulative frequency 30−40 is 35.
(iii) Range =70−10=60
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