1. The following figures show incubation periods of 9 polio cases. Find
the median of the data.
23, 19, 21, 17, 22, 18, 20, 24, 16

2. Compute the median for the following frequency distribution.
Size Below 10 10-12 12-14 14-16 16-18 18-20

Demand 3 15 27 20 3 2
3. Find the median of the data set: (102, 403, 729, 843, 920, 360, 842,

941, 357, 483, 207,670, 471, and 109).
4. Following table gives the cumulative frequency of the age group of

teachers. Find the mean and median of the group.
Age in 20-25 25-30 30-35 35-40 40-45 45-50 50-55 55-60 60-65 65-70
Years
Cum.f 21 40 90 130 146 166 176 186 195 199

5. Find the missing frequency of the following frequency distribution if
the median is 37.5.

Class 0-10 10-20 20-30 30-40 40-50 50-60 60-70
Frequency 3 ? 8 12 10 7 5

6. Find the median from the following data.
Class limits 0-30 30-60 60-90 90-120 120-150 150-180
frequency 8 13 22 27 18 7

7. Calculate the mode for the following data.
Class interval 0-10 10-20 20-30 30-40 40-50

Frequency 10 14 19 17 13
8. The following data is the result of 400 HIV positive men in a reported

age group of India. Calculate the mode from the given data.
Age limit 20-24 25-29 30-34 35-39 40-44 45-49 50-54

Frequency 2 85 135 91 57 20 10
9. Fine the mode for the following frequency distribution.

Size Below 10 10-12 12-14 14-16 16-18 18-20
Demand 3 15 27 20 3 2

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