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Bar Graph, Histogram and Frequency Polygon — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsBar Graph, Histogram and Frequency Polygon5 Marks
Question
Draw a histogram and the frequency polygon from the following data:
Class interval
$20-25$
$25-30$
$30-35$
$35-40$
$40-45$
$45-50$
Frequency
$30$
$24$
$52$
$28$
$46$
$10$
✓

Answer

The given frequency distribution table is below:
Class intervals
$20-25$
$25-30$
$30-35$
$35-40$
$40-45$
$45-50$
Frequency
$30$
$24$
$52$
$28$
$46$
$10$
Take class intervals along $x$-axis and frequencies along and draw rectangle s of width equal to the size of the class intervals and hights equal to the corresponding frequencies. Thus we get the required histogram. Now take imaginary class intervals $15-20$ at the beginning and $50-55$ at the end, each with frequency zero and join the mid points of top of the rectangles to get the reuaired frequency polygon.

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