Final answer:
The probability of drawing a heart or a queen from a standard deck of playing cards is approximately 0.308.
Step-by-step explanation:
When drawing one card from a standard deck of playing cards, there are 52 possible outcomes, as there are 52 cards in the deck.
Out of these 52 cards, there are 13 hearts and 4 queens. However, we must subtract 1 queen of hearts from the total, as it falls into both categories.
Therefore, the probability of drawing a heart or a queen is (13 + 4 - 1) / 52 = 16 / 52 = 4 / 13 ≈ 0.308.