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iGCSE (2021 Edition)

22.05 Stem-and-leaf diagrams

Interactive practice questions

The level of mercury in $40$40 fishing waters was tested and recorded. The results are given below.

Stem Leaf
$9$9 $0$0 $2$2 $2$2 $5$5 $6$6 $8$8 $8$8 $9$9
$10$10 $2$2 $4$4 $5$5 $5$5 $6$6 $7$7 $8$8 $8$8 $8$8 $9$9 $9$9 $9$9 $9$9
$11$11 $1$1 $2$2 $7$7 $9$9
$12$12 $2$2 $7$7
$13$13 $0$0 $0$0 $2$2 $2$2 $3$3 $3$3 $5$5 $5$5 $6$6 $6$6 $7$7 $8$8$9$9
 
Key: $1$1$\mid$$2$2$=$=$12$12
a

What was the highest reading?

b

What was the seventh lowest reading?

c

How many readings of $122$122 or higher were recorded?

d

The level of mercury is deemed to be safe if the reading is $119$119 or lower. What fraction of the readings correspond to a safe level?

Hard
2min

This stem-and-leaf diagram records the ages of customers at a beachside café last Sunday.

Easy
< 1min

An online booking website allows customers to buy tickets to concerts. Over the last month, the website has been tracking how many tickets are sold in the first minute after they go on sale. The results are displayed in this stem-and-leaf diagram:

Easy
2min

Find the median from the following stem-and-leaf diagram:

Medium
1min
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Outcomes

0580C9.1

Collect, classify and tabulate statistical data.

0580C9.2

Read, interpret and draw simple inferences from tables and statistical diagrams. Compare sets of data using tables, graphs and statistical measures. Appreciate restrictions on drawing conclusions from given data.

0580C9.3C

Construct and interpret stem-and-leaf diagrams.

0580E9.1

Collect, classify and tabulate statistical data.

0580E9.2

Read, interpret and draw simple inferences from tables and statistical diagrams. Compare sets of data using tables, graphs and statistical measures. Appreciate restrictions on drawing conclusions from given data.

0580E9.3C

Construct and interpret stem-and-leaf diagrams.

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