PRACTICE A card is chosen at random from the box containing 10 cards: 3 yellow, 4 red, 2 green, and 1 blue. SEE EXAMPLES 1 AND 2 16. Define a probability distribution for this experiment on the sample space $\{Y, R, G, B\}$.

Step 1 ：Find the probability of each color card being chosen by dividing the number of cards of each color by the total number of cards: \(P(Y) = \frac{3}{10}\), \(P(R) = \frac{4}{10}\), \(P(G) = \frac{2}{10}\), \(P(B) = \frac{1}{10}\)

Step 2 ：\boxed{P(Y) = 0.3, P(R) = 0.4, P(G) = 0.2, P(B) = 0.1}