Question
The masses, m grams, of 165 pebbles are recorded. 0 < m ≤ 20 has frequency 24; 20 < m ≤ 30 has frequency 45; 30 < m ≤ 50 has frequency 56; 50 < m ≤ 90 has frequency 40. A histogram has a vertical axis labelled frequency density. The bar for 0 < m ≤ 20 has already been drawn with height 1.2.
Complete the histogram. Write down, for each of the three remaining bars, the interval it covers and the frequency density you would use as its height.
[3 marks]
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