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# How do you find the range of something?

## Answer

###### Wiki User

###### February 28, 2012 10:57PM

Problem:Cheryl took 7 math tests in one marking period. What is
the range of her test scores?89, 73, 84, 91, 87, 77,
94Solution:Ordering the test scores from least to greatest, we
get:73, 77, 84, 87, 89, 91, 94highest - lowest = 94 - 73 =
21Answer:The range of these test scores is 21
points.**Definition:**The **range** of a set of data is the
difference between the highest and lowest values in the set.

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### How do you find the interquartile range of a data?

The Inter-quartile range is the range of the middle half of the
data. It is the difference between the upper and lower
quartile.
Example: 35,80,100 110,120,120,170,180.
The Inter-quartile range would be 145-90 or 55
To find the interquartile range, you:
1) Arrange the data in numerical order.
2) Then find the median of the data sets.
3) Find the median of the top half and bottom half. (of the set
of numbers)
4) The groups you now have are "quartiles"
5) Find the interquartile range. (subtract the smaller range
from the range)