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Official Explanation

Two American League pitchers had an ERA between 2.00 and 2.49, and two National League pitchers had an ERA greater than 4.99. However, it looks like more National League pitchers than American League pitchers are included in the graph and, if you count you’ll find 50 National League pitchers and 42 American League pitchers. So, the probability that an American League pitcher had an ERA between 2.00 and 2.49 is 2 out of 42, which is greater than2 out of 50, the probability that a National League pitcher had an ERA greater than 4.99.

The correct answer is (C).

Two American League pitchers and three National League pitchers had an ERA between 2.00 and 2.49. Six American League pitchers and five National League pitchers had an ERA between 2.50 and 2.99. In total, 16 pitchers—eight in each league—had an ERA between 2.00 and 2.99, so the probability that a pitcher with an ERA between 2.00 and 2.99 was a National League pitcher is 0.5.

The correct answer is (C).
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