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Based on Louis's recorded frequencies, he pulled the red marbles 2 times, blue marbles 4 times, yellow marbles 2 times, and black marbles 6 times out of the 14 pulls he made.
This information suggests that the probability of pulling a red marble is 2/14 = 1/7, the probability of pulling a blue marble is 4/14 = 2/7, the probability of pulling a yellow marble is 2/14 = 1/7, and the probability of pulling a black marble is 6/14 = 3/7.