Four MAT 114 instructors recently compared their classes' scores on the first exam. The mean and median for each instructors class is given in the table below.
For each instructor do the given values for mean and median seem to indicate that instructor's exam scores were skewed right, skewed left, or symmetric?
|
Instructor Mean Median Skewed right? Skewed left? Symmetric?
|
|
|
A
|
80.1
|
85.1
|
|
B
|
79.3
|
79.1
|
|
C
|
81.1
|
74.5
|
|
D
|
82.4
|
74.0
|
Calculate the standard deviation of the following data set.
3.2 5.8 11.6 16.2 18.2