Question

term. Find the mean number of days a student was absent.
0 - 6 | 6 - 10 10 - 1414 - 2020 - 2828 - 38 38 - 40
- |
days
Number of
10
7.
4
4
3
1 1
1
Number of
students
A class teacher has the following absentee record of 40 students of a class for the whole​

Answer 1

Answer:-

No. of days No. of student 

fixi fixi 0-6 11 3 33 6 - 10 10 8 80 10 - 14 7 12 84 14 - 20 4 17 68 20 - 28 4 24 96 28 - 38 3 3399 38 - 40 1 39 39 Σfi=40  Σfixi=499 The mean number of days a student was absent =ΣfiΣfixi=40499=12.475

Hence, the mean number of days a student was absent is 12.475.

Answer 2

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