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03/07/2021 11:11 am
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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 - Number of students
0-6 → 11
6- 10 → 10
10 - 14 → 7
14 - 20 → 4
20 - 28 → 4
28 - 38 → 3
38 - 40 → 1
1 Answer
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03/07/2021 11:13 am
Find the midpoint of the given interval using the formula.
Midpoint (xi) = (upper limit + lower limit)/2
The mean formula is,
Mean = x̄ = ∑fixi /∑fi
= 499/40
= 12.48 days
Therefore, the mean number of days a student was absent = 12.48.