One card is selected at random from a deck of cards. Determine the probability that the card selected is not a jack.
\[
\mathrm{P}(\text { not a jack })=\square
\]
(Simplify your answer.)

Step 1 ：One card is selected at random from a deck of cards. We are asked to determine the probability that the card selected is not a jack.

Step 2 ：There are 4 jacks in a deck of 52 cards. Therefore, the number of outcomes where the card is not a jack is \(52 - 4 = 48\).

Step 3 ：The total number of outcomes is 52, which is the total number of cards in the deck.

Step 4 ：We calculate the probability by dividing the number of outcomes where the card is not a jack by the total number of outcomes. This gives us \( \frac{48}{52} = 0.9230769230769231\).

Step 5 ：Final Answer: The probability that the card selected is not a jack is \(\boxed{0.923}\).