18. Statistics
iGCSE (2021 Edition)
18.04 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 | |
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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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