Final answer:
The probability of obtaining a quarter when randomly drawing a single coin out of the bag is 1/5.
Step-by-step explanation:
To find the probability of obtaining a quarter when randomly drawing a single coin out of the bag, we need to know the number of quarters and the total number of coins in the bag. Let's say there are 4 quarters and 20 coins in total. The probability would then be the number of favorable outcomes (getting a quarter) divided by the total number of possible outcomes (drawing any coin). In this case, the probability would be 4/20, which simplifies to 1/5 or 0.2 when rounded to 4 decimal places.