3. Mrs. McBee recorded the number of minutes her students spent studying one night and their grade on a pop
quiz the next day. The scatterplot below shows the data she
recorded.

Based on the scatterplot, what is the best prediction of the
grade a student who studied for half an hour would make?
A. 60
B. 50
C. 40
D. 80

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?