If one card is randomly selected from a well-shuffled standard deck of 52 cards, what is the probability that the card selected is not a heart?

Sure, here's how you can calculate the probability:

1. Identify the total number of outcomes: In a standard deck of 52 cards, there are 52 possible outcomes because each card in the deck is a unique outcome.

2. Identify the number of successful outcomes: There are 13 hearts in a deck of 52 cards. So, the number of cards that are not hearts is 52 - 13 = 39.

3. Calculate the probability: The probability of an event is given by the ratio of the number of successful outcomes to the total number of outcomes. So, the probability that the card selected is not a heart is 39/52 = 0.75 or 75%.