Find the range, mean, median, and mode of the following data set.
21, 14, 2, 9, 12, 3, 1, 8, 20
a.
Range 17
Mean 10
Median 9
Mode 9
c.
Range 20
Mean 11
Median 9
Mode none

b.
Range 20
Mean 10
Median 12
Mode none
d.
Range 20
Mean 10
Median 9
Mode none