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NCERT Solutions Class 10 Mathematics Solutions for Statistics - Exercise 14.1 in Chapter 14 - Statistics
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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 by the direct method.
| 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:
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.
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