A study of about 1,800 U. S. colleges and universities resulted in the demand equation q = 9,500 − 2p,

where q is the enrollment at a college or university, and p is the average annual tuition (plus fees) it charges.

(a) The study also found that the average tuition charged by universities and colleges was $3,000. What is the corresponding price elasticity of demand? (Round your answers to two decimal places.)

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?