Companies that manufacture chain saws know that careful manufacturing produces parts that are practically identical and sloppy manufacturing produces parts that are quite variable.Sprockets are an important part of chain saws.The following numbers are measurements (in millimeters) of sprockets made by two different companies.Which company is most consistent in the production of sprockets? Show your work.

McCullochStihl

25.030.7

25.731.4

25.930.9

25.331.0

25.530.9

(A)Which company is more consistent?

(B)For McCulloch, the variance =