3. Find the mean of the following frequency distributions:
Daily wages (in Rupees)
100
150
200
250
300
400
500
Number of workers
4
3
2
15
5
4
2
Don't give irrevalent answer
Answers
Answer:
Step-by-step explanation:
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.) 0 - 2 2 - 4 4 - 6 6 - 8 8 - 10
No. of students 7 18 12 10 3
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
Hence, the mean time spent by students for their studies is 4.36 hours.
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.) 0 - 2 2 - 4 4 - 6 6 - 8 8 - 10
No. of students 7 18 12 10 3
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
Hence, the mean time spent by students for their studies is 4.36 hours.