P&Q is a plastic bucket manufacturer. It chooses to use polypropylene in manufacturing the buckets because it is strong and can usually withstand high temperatures.

P&Q’s quality control inspector is testing the polypropylene strengths (in MPa) provided by three different suppliers. P&Q samples 5 buckets from each supplier. The test results are recorded for each as follows:

Supplier A Supplier B Supplier C 30.7 34.6 30.7 24.7 41.9 40.7 30.6 36.4 20.5 32.8 22.2 34.2 20.7 20.7 24.2 The quality control inspector will choose the supplier that provides the least variation of polypropylene strength. Compute appropriate calculations to assist the quality control inspector to make his decision.