Question

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: 

Time (hrs.)	No. of students
0 - 2	8
2 - 4	14
4 - 6	18
6 - 8	10
8 - 10	10

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:

Class (Time in hours)	Class Mark (xi)	Number of students (fi)	fixi
0 - 2	1	8	8
2 - 4	3	14	42
4 - 6	5	18	90
6 - 8	7	10	70
8 - 10	9	10	90

Answer 1

Class (Time in hours)	Class Mark xi	Frequency (Number of students) fi	Class mark × Frequency fixi
0 - 2	1	8	8
2 - 4	3	14	42
4 - 6	5	18	90
6 - 8	7	10	70
8 - 10	9	10	90
		∑fi = 60	∑fixi = 300

Mean = `(sum f_i x_i)/(sum f_i)`

= `300/60`

= 5 hours

∴ The mean time spent by students for their studies is 5 hours.