The number of non-defective units in the batch is 500 - 25 = 475.
The relative frequency of a non-defective unit is the number of non-defective units divided by the total number of units:
475/500 = 0.95
To express this as a fraction, we can write:
0.95 = 95/100
We can simplify this fraction by dividing both the numerator and denominator by 5:
95/100 = 19/20
Therefore, the relative frequency of a non-defective unit is 19/20.
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 your answer in the simplest form of a fraction.
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