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Question 8:

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 − 10

10 − 14

14 − 20

20 − 28

28 − 38

38 − 40

Number of students

11

10

7

4

4

3

1

Answer:

To find the class mark of each interval, the following relation is used.

Taking 17 as assumed mean (a), di and fidi are calculated as follows.

Number of days

Number of students

fi

xi

di = xi − 17

fidi

0 − 6

11

3

− 14

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