A calculator manufacturing company checks 500 calculator units, and 25 of the have non-functioning key Approximately the relative frequency of a non-defective unit from this batch of items. Express your answer in this simplest form of a fraction

Answer 1

The relative frequency of a non-defective unit is equal to 1 minus the relative frequency of a defective unit.

Relative frequency of defective units = 25/500 = 1/20

Relative frequency of non-defective units = 1 - 1/20 = 19/20

Therefore, the relative frequency of a non-defective unit is 19/20.