The mode of the data set {25, 15, 30, 15, 24} is 15.
Explanation:
The mode is the most frequently occurring number in a data set. In this case, the number 15 appears twice, while the other numbers appear only once. Therefore, 15 is the mode.
Here is a table that shows the frequency of each number in the data set:
Number Frequency
25 1
15 2
30 1
24 1
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As you can see, the number 15 has the highest frequency, so it is the mode.
Note: If all of the numbers in a data set appear the same number of times, then there is no mode. This is called a bimodal data set, which means that there are two modes.