The following sample data are presented: 1.8, 1.9, 1.8, 2.4, 5.1, 3.1, 5.5, 5.1, 8.3, 13.7, 5.3, 4.9, 3.7, 3.8, 9.8. Calculate the following:

a) mean (3 points)

b) mode (2 points)

c) median (2 points)

d) middle axis (4 points)

e) rank (2 points)

f) variance (4 points)

g) standard deviation (2 points)