Final answer:
The probability that a card chosen at random from a standard deck is not a face card is 40 out of 52, which simplifies to 10 out of 13.
Step-by-step explanation:
To find the probability that a card chosen at random from a standard deck is not a face card, we consider the total number of cards in the deck and the number of face cards. There are 12 face cards in a deck (J, Q, K of each suit), with 3 face cards per suit.
Since there are 52 cards in total and 12 are face cards, there are 52 - 12 = 40 cards that are not face cards. Therefore, the probability of drawing a card that is not a face card is the number of non-face cards divided by the total number of cards, which is 40/52.
Moreover, this fraction can be simplified by dividing both the numerator and the denominator by the common factor of 4. Thus, the simplified fraction representing the probability is 10/13.