These data sets provide the responses of 10 students in class A and class B who were asked how many hours they slept at night. Class A: {7, 6, 7, 8, 8, 7, 4, 5, 6, 7}

Class B: {7, 7, 6, 5, 7, 6, 8, 9, 6, 8}

Which statement is true for the two data sets?

A. The median sleeping time is greater for class A than for class B.

B. The median sleeping time is greater for class B than for class A.

C. The average, or mean, sleeping time is greater for class B than for class A.

D. The average, or mean, sleeping time is greater for class A than for class B.