Range
The range is the simplest measure of spread in a numerical data set. It does not measure the centre like mean and median but it measures how spread out the data set is.
Thoi and Bini sell movie tickets on the weekdays
|
|
M |
T |
W |
T |
F |
|
Thoi |
20 |
17 |
22 |
24 |
19 |
|
Bini |
5 |
20 |
10 |
58 |
9 |
Both the data sets have the same mean (20.4) and median (20). However, the sets are quite different. Finding out the range for each data set will measure how spread out the data sets are.
The range can be calculated by finding out the highest and lowest numbers of sales of tickets.
|
|
Highest |
Lowest |
|
Thoi |
24 |
17 |
|
Bini |
58 |
5 |
To find the range, the lowest is subtracted from the highest
|
|
Range |
|
Thoi |
24 – 17 = 7 |
|
Bini |
58 – 5 = 53 |
Here, Thoi's range is quite small compared to Bini's. Hence, we might say that the ticket sales of Thoi are more predictable than that of Bini.
Range = Highest score - Lowest Score
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