Find the range and mode of the data 17, 18, 28, 19, 16, 18, 17, 29, 18 ?

Sorted data: 16, 17, 17, 18, 18, 18, 19, 28, 29. Range = largest − smallest = 29 − 16 = 13. The value 18 appears most often (three times), so the mode is 18.