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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What was the highest reading?
What was the seventh lowest reading?
How many readings of $122$122 or higher were recorded?
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?
This stem-and-leaf diagram records the ages of customers at a beachside café last Sunday.
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:
Find the median from the following stem-and-leaf diagram: