A calculator manufacturing company checks 500 calculator units and finds that 25 of them have non-functioning ke. What is the relative frequency of a non-defective calculator from this batch of items?
475/500
19/20
1/20
25/500
19/20
Explanation: The relative frequency of a non-defective calculator is equal to the number of non-defective calculators divided by the total number of calculators. In this case, the number of non-defective calculators is 500 - 25 = 475, and the total number of calculators is 500. Therefore, the relative frequency is 475/500 or 19/20.