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The time required for students to do a s...

The time required for students to do a science experiment and the number of students is shown in the following grouped frequency distribution table. Show information by a histogram and also by a frequency polygon.

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For drawing a frequency polygon, we take two additional classes.
` 18 - 20` with frequency zero and `32-34` with frequency zero.
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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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