Consider the following number of defective circuit boards produced by two different machines on seven randomly selected days.

Machine Defects
A 2 3 7 4 5 1 0
B 2 3 4 3 4 2 4

a) To three decimel places what is the mean of machine A?
b) To three decimel places what is the mean of machine B?
c) To 2 decimel places, what is the variance of machine A?
d) To two decimel places what is the variance of machine B?
e) To two decimel places, what is the standard deviation of machine A?
f) To two decimel places, what is the standard deviation of machine B?
g) Select the statement that best describes the machines.

- Can not compare, because there is not enough info
- Machine A is Better than machine B
- Machine B is Better than machine A
- Machine A is the same as machine B