To calculate the probability of drawing two diamond cards, we need to first determine the total number of ways to draw 2 cards from a deck of 52.
Total number of ways to draw 2 cards = 52C2 = (52!)/(2!(52-2)!) = 1326
Next, we need to determine the number of ways to draw 2 diamond cards from the 13 diamond cards in the deck.
Number of ways to draw 2 diamond cards = 13C2 = (13!)/(2!(13-2)!) = 78
Therefore, the probability of drawing two diamond cards = (Number of ways to draw 2 diamond cards) / (Total number of ways to draw 2 cards)
= 78/1326
≈ 0.0588
Converting this to a percentage and rounding to the nearest hundredth, the probability of drawing two diamond cards is approximately 5.88%.