A calculator manufacturing company checks 500 calculator units and finds that 25 of them have non- functioning keys. What is the relative frequency of a non-defective calculator from the batch of items?
A. 475/500
B. 19/20
C. 1/20
D. 25/500
A. 475/500
Relative frequency can be calculated by dividing the number of non-defective items by the total number of items. In this case, the number of non-defective calculators is 500 - 25 = 475. Therefore, the relative frequency of a non-defective calculator is 475/500.