Statistics
A class teacher has the following absentee record of 40 students of a class for the whole term. Find the mean number of days a student was absent.
Number of days: | 0-6 | 6-12 | 12-18 | 18-24 | 24-30 | 30-36 | 36-42 |
Number of students: | 10 | 11 | 7 | 4 | 4 | 3 | 1 |
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CBSE Board Paper 2019
The mean of the following distribution is 18. Find the frequency f of the class 19 – 21.
OR
The following distribution gives the daily income of 50 workers of a factory :
Convert the distribution above to a less than type cumulative frequency distribution and draw its ogive.
Class | 11-13 | 13-15 | 15-17 | 17-19 | 19-21 | 21-23 | 23-25 |
Frequency | 3 | 6 | 9 | 13 | f | 5 | 4 |
OR
The following distribution gives the daily income of 50 workers of a factory :
Daily Income (in Rs) | 100-120 | 120-140 | 140-160 | 160-180 | 180-200 |
Number of workers | 12 | 14 | 8 | 6 | 10 |
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CBSE Board Paper 2018
If the mean of the following frequency distribution is 49, find the missing frequency p.
Class |
Frequency |
0 − 20 |
2 |
20 − 40 |
6 |
40 − 60 |
p |
60 − 80 |
5 |
80 − 100 |
2 |
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CBSE Board Paper 2007