A table records the value 2 once, the value 4 three times and the value 7 twice. What is the range of these six values?

Explanation

The largest value recorded is 7 and the smallest is 2, so the spread from one end of the data to the other is 7 - 2 = 5. Subtracting the largest count from the smallest, 3 - 1, gives 2, but counts say only how often a value appeared and never enter the spread of the values themselves.