A single card is drawn from a standard 52-card deck. Find the conditional probability that the card is a heart, given that it is a queen. The probability that the card is a heart is and the probability that the card is a queen is (Simplify your answers.)

Step 1 ：A single card is drawn from a standard 52-card deck. We are asked to find the conditional probability that the card is a heart, given that it is a queen.

Step 2 ：There are 4 queens in a standard 52-card deck, and one of them is a heart.

Step 3 ：So, the conditional probability that the card is a heart, given that it is a queen, is calculated as the number of heart queens divided by the total number of queens, which is \(\frac{1}{4}\).

Step 4 ：Final Answer: The conditional probability that the card is a heart, given that it is a queen, is \(\boxed{0.25}\).