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? as a fraction
The relative frequency of a non-defective calculator is the number of non-defective calculators divided by the total number of calculators checked.
Number of non-defective calculators = 500 - 25 = 475
Relative frequency of non-defective calculators = 475 / 500 = 19/20
Therefore, the relative frequency of a non-defective calculator from this batch of items is 19/20.