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An example of online maths tuition for GCSE or IGCSE level. The topic is histograms.

Histograms: With a Bar Chart, the TALLEST bar represents the most popular item or category whereas, with a Histogram, it is the bar with the largest AREA. In this question, we were told that there were 16 patients who spent between 10 and 15 minutes at the surgery and this was enough information to relate the area of each bar to the number of patients and to work out the vertical scale (Frequency Density). The final part of the question required us to determine the percentage of patients who spent between 25 and 40 minutes at the surgery.

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