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 this batch of items?
A. 475/500
B. 19/20
C. 1/20
D. 25/500
A. 475/500
Relative frequency of non-defective calculators = (Number of non-defective calculators) / (Total number of calculators)
= (500 - 25) / 500
= 475 / 500