Question

# The following data were acquired in a study of diabetic patients. Ages 10-20 20-30 30-40 40-50 50-60 No. of patients 7 11 19 9 1 Construct a frequency polygon for the data given.

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 the all the classes. Class intervals (Ages) Frequency (No. of patients) Class marks Points 0-10 0 5 (5,0) 10-20 7 15 (15,7) 20-30 11 25 (25,11) 30-40 19 35 (35,19) 40-50 9 45 (45,9) 50-60 1 55 (55,1) 60-70 0 65 (65,0) Take suitable scale, On X-axis 1 cm = 1 class interval On Y-axis 1 cm = 2 patients Take class marks on X-axis and frequency on Y-axis. Now plot the points in the graph.

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