The back-to-back stem-and-leaf plot below shows exam scores from two different math classes.  What is the mode and mean for class A and the range and median for class B?


A. mode class A = 1
mean class A = 59.4
range class B = 50
median class B = 77
B. mode class A = 61
mean class A = 59.4
range class B = 54
median class B = 78
C. mode class A = 59
mean class A = 56.5
range class B = 54
median class B = 90
D. mode class A = 1
mean class A = 56.5
range class B = 52
median class B = 80