Aphilosophy professor assigns letter grades on a test according to the following scheme. a: top 12% of scores b: scores below the top 12% and above the bottom 57% c: scores below the top 43% and above the bottom 17% d: scores below the top 83% and above the bottom 9% f: bottom 9% of scores scores on the test are normally distributed with a mean of 81.2 and a standard deviation of 8.1

Here are the 30 best lifetime baseball batting averages of all time, arranged in order from lowest to highest: 0.319, 0.329, 0.330, 0.331, 0.331, 0.333, 0.333, 0.333, 0.334, 0.334, 0.334, 0.336, 0.337, 0.338, 0.338, 0.338, 0.340, 0.340, 0.341, 0.341, 0.342, 0.342, 0.342, 0.344, 0.344, 0.345, 0.346, 0.349, 0.358, 0.366 if you were to build a histogram of these data, which of the following would be the best choice of classes?