Following information pertains to the daily income of 150 families. Calculate Arithmetic Mean :
Daily Income Frequency
More than 75 150
More than 85 140
More than 95 115
More than 105 95
More than 115 70
More than 125 60
More than 135 40
More than 145 25
Or
Find out the Mode of he following series:
Marks Frequency
0-10 5
10-20 10
20-30 25
30-40 15
40-50 10
50-60 5
Answers
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5
Answer:
Income
No. of families
Frequency
Mid Value
fm
Class Interval
(CF)
(f)
(m)
75 – 85
150
150 – 140 = 10
80
800
85 – 95
140
140 – 115 = 25
90
2250
95 – 105
115
115 – 95 = 20
100
2000
105 – 115
95
95 – 70 = 25
110
2750
115 – 125
70
70 – 60 = 10
120
1200
125 – 135
60
60 – 40 = 20
130
2600
135 – 145
40
40 – 25 = 15
140
2100
145 – 155
25
25
150
3750
Total
∑f=150 ∑fm=17450
Mean
=∑fm∑f=17450150
= Rs 116.33
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