CAIE IGCSE Mathematics Extended Statistical Charts

Practise turning frequencies or summary statistics into accurate pie-chart sectors, ordered stem-and-leaf displays and scaled box-and-whisker plots.

Exam points

calculate a category's pie-chart angle as its fraction of the total multiplied by 360°
sort the raw observations into ordered leaves and provide a key showing their place value
draw the box, median and whiskers at the five-number-summary positions on the given scale

[Maximum number: 4]

(a)

The list shows 15 midday temperatures, in degrees Celsius, in Suntown.

[ 4 ]

(i)

Complete the stem-and-leaf diagram to show this information.

Key: $1 \mid 7$ represents $17^{\circ} \mathrm{C}$

[ 2 ]

(ii)

Rahul draws a pie chart to show this information.

Calculate the sector angle for the number of days the temperature is $18^{\circ} \mathrm{C}$ .

[ 2 ]

48
M1 for $\frac{2}{15}\times360$ or $\frac{360}{15}\times2$

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