Question

Mark has saved 150 quarters in a jar. Of that total,
25 were minted before 1970, 35 were minted
between 1970 and 1980, and the remaining quarters
were minted after 1980. If Mark picks a quarter
out of the jar without looking, what is the probability
that he will pick a quarter minted after
1980?

Answer 1

The total number of outcomes is 150. The number minted after 1980 is 150-25-35 or 90. So the probability of picking a quarter minted after 1980 is 90/150 or 3/5