Question

6. A survey of 60 students for the amount of pocket money given to them yielded the following:
)
Amount (in )
100
200
250
300
Number of students
350
400
4
8
18
20
7
3
Find the average amount of pocket money.
​

Answer 1

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.