To find the average of the set of numbers 80, 60, 17, and 13, you can follow these steps:
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Add all the numbers together: \[ 80 + 60 + 17 + 13 = 170 \]
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Count the number of values: There are 4 numbers in this set.
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Divide the total sum by the count of numbers: \[ \text{Average} = \frac{170}{4} = 42.5 \]
Therefore, the average of the numbers 80, 60, 17, and 13 is 42.5.