The Nguyen family and the Cooper family each used their sprinklers last summer. The water output rate for the Nguyen family's sprinkler was 30L per hour. The water output rate for the Cooper family's sprinkler was 35L per hour. The families used their sprinklers for a combined total of 40 hours, resulting in a total water output of 1325L. How long was each sprinkler used?

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?