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Illustration
In a social survey whether the main reason was to establish the intelligence quotient or IQ of resident in a provided area, the given results were acquired as tabulated below as:
IQ
No. of residents
Upper class bound
CF
1 - 20
6
20
21 - 40
18
40
24
41 - 60
32 fo
60
56
61 - 80
48 f1
80
104
81 - 100
27 f2
100
131
101 - 120
13
120
144
121 - 140
2
140
146
Required
Estimate the modal value of the IQ's tabulated as given above using
i. The graphical method
ii. Formular
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