Final answer:
The probability that a number card chosen at random has the number 4/9 on it is 0, as 4/9 is not a whole number and each card has a whole number on it.
Step-by-step explanation:
The question is referring to a scenario where Charlotte has some number cards with whole numbers on them. Therefore, the probability that the number on a card she chooses at random is 4/9 is literally impossible. This is because we are told that each card has a whole number on it, and 4/9 is not a whole number but rather a fraction. Probabilities are determined by the ratio of the desired outcomes to the total number of possible outcomes. In this case, since a fractional number like 4/9 cannot exist on a card that should have whole numbers, the probability is 0. The options provided (1/9, 2/9, 3/9, 4/9) do not include the correct answer, which indicates that there might be an error or misunderstanding in the formulation of the question itself.