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The time required for some students to c...

The time required for some students to complete a science experiment and the number of students is shown in the following grouped frequency distribution table. Draw the frequency polygon with the help of histogram using given information `:`
`{:("Time required for experiment ( minutes)",20-22,22-24,24-26,26-28,28-30,30-32),("Number of students",6,14,20,16,12,10):}`

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For drawing frequency polygon, we have to take two additional classes.
18-20 with frequency zero and 32-40 with frequency zero.
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