At a certain high school, 38% of freshmen and 31% of sophomores walk to school. Suppose that random samples of 40 freshmen and 45 sophomores are chosen. Let S = the proportion of sophomores who walk to school and F=
the proportion of freshmen who walk to school. What is the probability that the proportion of sophomores who
walk to school is greater than the proportion of freshmen?
Find the z-table here.
O 0.248
0.277
0.679
O 0.752