Question

# 45 students across the different levels of Intelligent Quotient are distributed in the grouped table given below. IQ 60-70 70-80 80-90 90-100 100-110 110-120 120-130 No. of patients 3 6 9 11 11 7 2 Draw the frequency polygon for the data.

A
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B
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C
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D
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Solution

## The correct option is B We have to first calculate the class marks of all the classes. Class intervals (Ages) Frequency (No. of patients) Class marks Points 50-60 0 55 (55,0) 60-70 3 65 (65,3) 70-80 6 75 (75,6) 80-90 9 85 (85,9) 90-100 11 95 (95,11) 100-110 11 105 (105,11) 110-120 7 115 (115,7) 120-130 2 125 (125,2) 130-140 0 135 (135,0) Take suitable scale , On X-axis 1 cm = class interval length On Y-axis 1 cm = 2 units Take class marks on X-axis and frequency on Y-axis Now plot the points on the graph.

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