To answer this question we will use the following expression to compute the probability that an event occurs:
[tex]\frac{FavorableOutcomes}{TotalOutcomes}.[/tex]We know that there are a total of 52 cards in a standard deck, and there are 16 cards that are a Queen or a Heart, therefore the probability of choosing a Queen or a Heart is:
[tex]\frac{16}{52}.[/tex]Simplifying the above result we get:
[tex]\frac{16}{52}\approx0.308.[/tex]Answer: 0.308.
