The first part is to identify the sample and the population in the given scenario:
The sample would come being 3 pails of oranges and the population is the truckload, that is 50 oranges.
Now to draw a conclusion from "the population if 5% of the sample was found to be unsatisfactory"
Numerically, we can say that a small part of the population is that they are unsatisfactory and, furthermore, we can say that the vast majority (95%) are satisfactory.