A calculator manufacturing company checks 500 calculator units, and 25 of them have non-functioning keys. Approximate the relative frequency of a non-deffective unit from this batch of items. Express the answer in the simplest form of a fraction
The relative frequency of a non-defective unit can be calculated by dividing the number of non-defective units by the total number of units checked.
Number of defective units = 25
Total number of units checked = 500
Relative frequency of non-defective units = (500 - 25) / 500
= 475/500
= 19/20
Therefore, the relative frequency of a non-defective unit from this batch of items is 19/20.