Measures of central tendency-graphical method , Mathematics

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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

6

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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