Final answer:
The probability of drawing a jack, queen, king, or ace from a single card draw from an ordinary deck of cards is 4/13.
Step-by-step explanation:
To calculate the probability of drawing a jack, queen, king, or ace from a single card draw from an ordinary deck of cards, we need to determine how many of these cards are in the deck. In a standard deck, there are 4 jacks, 4 queens, 4 kings, and 4 aces. So, there are a total of 16 cards out of 52 that are jacks, queens, kings, or aces.
The probability is then calculated by dividing the number of favorable outcomes (16) by the total number of possible outcomes (52). Therefore, the probability is 16/52, which can be simplified to 4/13.