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  • For drawing a frequency polygon of a continuous frequency distribution, we plot the points whose ordinates are the frequencies of the respective classes and abscissae are respectively : (A) upper limits of the classes (B) lower limits of the classes

For drawing a frequency polygon of a continuous frequency distribution, we plot the points whose ordinates are the frequencies of the respective classes and abscissae are respectively :

(A) upper limits of the classes

(B) lower limits of the classes

(C) class marks of the classes

(D) upper limits of preceding classes

Answers (1)

Answer : C

For drawing a frequency polygon of a continuous frequency distribution, we plot the frequency of the classes on the ordinates and the class marks of the classes on the abscissae.

Class mark is the mid value or the central value of a class

It is calculated as follows:

 \frac{\text {upper limit+lower limit}}{2}

For example

Class interval Class marks (x-coordinate) Frequency (y-coordinate)
10-20 15 7
20-30 25 8
30-40 35 9

Therefore option (C) is correct.

Posted by

infoexpert23

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