Set A and Set B each consist of 5 distinct numbers. The 2 sets contain identical numbers with the exception of the number with the least value in each set. The number with the least value in Set B is greater than the number with the least value in Set A. The value of which of the following measures must be greater for Set B than for Set A ?

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We can create example sets:

$$ \text{Set A}: 1, 5, 6, 7, 8 $$ $$ \text{Set B}: 2, 5, 6, 7, 8 $$

From this example, only the mean is greater. The range is smaller in Set B and the median is the same number.