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(c) 60 – 80
(d) 80 -100

7. For what value of y is the mode of the following data equal to 7?
3, 5, 6, 7, 3, 4, 7, 3, 6, y, 7.
8.Calculate the mode for the following frequency distribution:-
Class Frequency
0 - 10 5
10 - 20 8
20 - 30 7
30 - 40 12
40 - 50 28
50 - 60 20
60 - 70 10
70 - 80 10

9. Calculate the mode for the following frequency distribution:
Class 25 - 30 30 - 35 35 - 40 40 - 45 45 - 50 50 - 55
Frequency 25 34 50 42 38 14

10. The mode of the following series is 36. Find the missing frequency in it.
Class Interval 0 - 10 10 - 20 20 - 30 30 - 40 40 - 50 50 - 60 60 - 70
Frequency 8 10 x 16 12 6 7

11. Given below is the frequency distribution of the heights of players in a school.
Height (in cm) 160 - 162 163 - 165 166 - 168 169 - 171 172 - 174
Number of Students 15 118 142 127 18
Find the average height of maximum number of students.

12. The following table shows the age distribution of 'cases of a certain disease' admitted
during a year in a particular nursing home.

Age in Years Number of Cases
5 - 14 6
15 - 24 11
25 - 34 21
35 - 44 23
45 - 54 14
55 - 64 5

Find the average age for which maximum cases occured.

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