Measures of central tendency-graphical method , Mathematics

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	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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