A calculator manufacturing company checks 500 calculator units, and 25 of them have non-functioning keys. Approximate the relative frequency of a non-defective unit from this batch of items. Express your answer in the simplest form of a fraction. (1 point)
The relative frequency of a non-defective unit can be calculated by subtracting the number of defective units from the total units and then dividing by the total units.
Total units = 500
Defective units = 25
Non-defective units = 500 - 25 = 475
Relative Frequency of non-defective units = Non-defective units / Total units
Relative Frequency = 475 / 500 = 19 / 20
Therefore, the relative frequency of a non-defective unit from this batch of items is 19/20.