The following table shows the number of students and the time they utilized daily for their studies. Find the mean time spent by students for their studies by direct method.
Time (hrs.) : No. of students
0-2 : 7
2-4 : 18
4-6 : 12
6-8 : 10
8-10 : 3
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Answer:
Class
(Time in hours) Class Mark
xi Frequency
(Number of students)
fi Class mark × Frequency
xifi
0 - 2 1 7 7
2 - 4 3 18 54
4 - 6 5 12 60
6 - 8 7 10 70
8 - 10 9 3 27
∑fi=50 ∑xifi=218
Mean = ∑xifi∑fi
=21850
= 4.36 hours
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