The probability of choosing a red marble is the same as the probability of choosing any other marble, assuming all marbles are equally likely to be chosen. Let's say there are 10 marbles in the bag and 4 of them are red.
The probability of choosing a red marble on the first draw is 4/10 or 2/5.
Since the marbles are replaced, the probability of choosing a white marble on the second draw is also 2/5, assuming that there are 3 white marbles remaining in the bag after the first draw out of the original 10.
To find the probability of both events happening, we can multiply the probabilities together:
(2/5) x (2/5) = 4/25 or approximately 0.16.
Therefore, the probability of choosing a red marble, then a white marble if the marbles are replaced is 4/25 or approximately 0.16.