A calculator manufacturer 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?
The relative frequency of a non-defective calculator from this batch of items can be calculated by taking the total number of non-defective calculators and dividing it by the total number of calculators checked.
Total number of calculators checked = 500
Number of calculators with non-functioning keys = 25
Number of non-defective calculators = 500 - 25 = 475
Relative frequency of a non-defective calculator = Number of non-defective calculators / Total number of calculators checked
Relative frequency = 475/500 = 0.95
Therefore, the relative frequency of a non-defective calculator from this batch of items is 0.95 or 95%.