The height, $$$h \mathrm{~cm}$$$, of each of 120 plants is measured. The cumulative frequency diagram shows this information. The information in the cumulative frequency diagram is shown in this frequency table. A histogram is drawn to show the information in the frequency table. The height of the bar representing the interval $$$10< h \leqslant 20$$$ is $$$7.2 \mathrm{~cm}$$$. Calculate the height of the bar representing the interval $$$30< h \leqslant 50$$$. ........................................ $$$\mathrm{cm}$$$

Mathematics

IGCSE&ALevel

CAIE

Exam No：0580_w20_qp_42 Year：2020 Question No：4(b)(ii)

Answer:

7.6

Knowledge points:

E9.3 Construct and interpret bar charts, pie charts, pictograms, stem-and-leaf diagrams, simple frequency distributions, histograms with equal and unequal intervals and scatter diagrams. (For unequal intervals on histograms, areas are proportional to frequencies and the vertical axis is labelled ‘frequency density’.)

Answer:

Knowledge points:

Solution:

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