A calculator manufacturing company checks 500 calculator units, and 25 of them have non-functioning keys. Approximate the relative frequency of a non-defective unit from this batch of items. Express y
our answer as a percentage.
Relative frequency of non-defective units = (Total units - Defective units) / Total units
Relative frequency of non-defective units = (500 - 25) / 500
Relative frequency of non-defective units ≈ 475 / 500
Relative frequency of non-defective units ≈ 0.95
To express this as a percentage, multiply by 100:
Relative frequency of non-defective units ≈ 0.95 * 100
Relative frequency of non-defective units ≈ 95%
Therefore, the approximate relative frequency of a non-defective unit from this batch of items is 95%.