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)
0하
〇器
• 200
• 175
The relative frequency of a non-defective unit is calculated by subtracting the number of defective units from the total units and then dividing by the total number of units:
Relative frequency of non-defective units = (500 - 25) / 500 = 475 / 500 = 95 / 100 = 19 / 20
Therefore, the relative frequency of a non-defective unit from this batch of items is 19/20.