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.
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.
From the table, we obtain
Therefore, the mean number of days is 12.48 days for which a student was absent.
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