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The range is the difference between the largest and smallest values in a data set.
To find the largest value, we can arrange the data set in order from smallest to largest:
13, 28, 42, 51, 76, 98
The largest value is 98.
To find the smallest value, we can again arrange the data set in order from smallest to largest:
13, 28, 42, 51, 76, 98
The smallest value is 13.
Therefore, the range of the data set is:
98 - 13 = 85
So the range is 85.