The Ridgeport school district collected data about class size in the district. The table shows the class sizes for five
randomly selected kindergarten and seventh-grade
classes
Mean Mean absolute
deviation
Number of students in randomly
selected class
Kindergarten 19, 19.23, 30, 19
Seventh 27, 33, 34, 30, 31
grade
22
3.6
31
2.0
sed on these data, which statement is true?
A. The average size of a seventh-grade class is larger and varies
more than that of a kindergarten class.
B. The recommended number of students in a kindergarten class is
22.
C. Every seventh-grade class has 9 more students than a
kindergarten class.
D. The average size of a seventh-grade class is larger but varles less
than that of a kindergarten class.