Q9 of 47 Page 70

Construct a frequency polygon for the following data without using histogram

GIVEN.


FORMULA USED: Adjustment Factor = [Lower limit –


Upper limit of preceding interval]


Adjustment Factor = [35-34]


= 0.5


⇒ First make the data in continuous form


IN each interval subtract 0.5 in upper limit and add 0.5 in


lower limit.


∴ the Table will be



⇒ Take out Midpoints of Each class intervals



⇒ Mark class interval along X axis on uniform scale


⇒ Mark frequency along Y axis on uniform scale


Take 2 imaginary midpoints on 1st and last with 0 frequency



⇒ join all the midpoints to get frequency polygon



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Construct a frequency polygon from the following data using histogram.

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Draw a frequency polygon for the following data without using histogram

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The following are the marks obtained by 40 students in an English examination (out of 50 marks). Draw a histogram and frequency polygon for the data

29, 45, 23, 40, 31, 11, 48, 11, 30, 24, 25, 29, 25, 32, 31, 22, 19, 49, 19, 13,32, 39, 25, 43, 27, 41, 12, 13, 32, 44, 27, 43, 15, 35, 40, 23, 12, 48, 49, 18.

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Yugendran’s progress report card shows his marks as follows:


Draw a pie chart exhibiting his mark in various subjects.