Unit 1: Collection, Display, And Interpretation Of Data Worksheet - 6th Grade Page 10
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44Date
Time
LESSON
Old Faithful Erupts
1 3
A geyser is a natural fountain of water and steam that erupts from the ground. Old
Faithful is perhaps the most studied geyser of Yellowstone Park. Its eruptions have
135 136
been recorded since its discovery in 1870. Mathematicians have examined the
relationship between the time in minutes an eruption lasts, which is called the
duration, and the time to the next eruption, which is called the interval.
Duration data appear in the table below.
Duration of Old Faithful Eruptions (in min)
(Number of Observations: 48)
4.9
1.7
2.3
3.5
2.3
3.9
4.3
2.5
3.4
4.8
4.1
1.9
4.6
4.1
2.9
3.7
3.4
1.7
1.7
3.3
4.0
4.6
3.1
2.9
4.1
4.6
2.0
3.5
4.2
4.7
1.8
4.0
1.8
1.9
2.3
2.0
4.5
3.7
3.9
3.9
1.9
4.3
3.2
4.7
3.5
2.0
1.8
4.5
A stem-and-leaf plot is a useful way to find landmarks when there are many data
values in random order. The stem-and-leaf plot of the eruption data appears below.
Duration of Old Faithful Eruptions
(Number of Observations: 48)
Stems
Leaves
(ones)
(tenths)
1
7 7 7 8 8 8 9 9 9
2
0 0 0 3 3 3 5 9 9
3
1 2 3 4 4 5 5 5 7 7 9 9 9
4
0 0 1 1 1 2 3 3 5 5 6 6 6 7 7 8 9
The data in the plot are ordered, making it easier to determine data landmarks.
Using the stem-and-leaf plot above, find the minimum, maximum, and range of
the duration data.
minimum
maximum
range
a.
b.
c.
10
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