Math 702 Lesson 3 The Range Of Data / Lesson 4 Calculating Interest For Months Worksheet
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3
The Range of Data
The range of a list of data is the difference between the highest and the lowest numbers in the list. To
find the range, subtract the smallest number from the largest.
On their last Math LightUnit test, Eva’s seventh-graders made these scores:
90% 92% 78% 100% 87% 95%
To find the range of these grades, subtract 78% from 100%. The range of the student’s math scores
was 22%.
P
U
M
M
RACTICAL
SE OF
EAN AND
EDIAN
Mean is the most common way to summarize numerical data. But sometimes the
mean can be misleading. This is especially true when the range is large and a few
numbers are much higher or much lower than most of the others. If you were finding the
mean value of the homes in your community, and there were several million-dollar homes
there, the average may be quite a bit higher than most of the homes are really worth. In
this case, the median might be a better measure of the worth of the homes in your area.
The median is especially useful when the range of the data is large and the set of data is
relatively small. It may also be useful because it is not generally affected by data that is
extreme, as in the example of the expensive homes above.
Find the range for each list of numbers.
1. 93, 100, 97, 97, 100, 90, 100, 100, 97
range
2. 15°, 32°, 19°, 2°, 7°, 15°, 12°, 15°, 17°, 14°, 20°
range
3. $35, $90, $88, $78, $67, $96, $44, $61, $96
range
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