Problem:
Suppose your manager presents you with the following information about machines that could be used for a job, and wants your recommendation on which one to choose. The specification width is .48 mm. In this instance, you can narrow the set of choices, but you probably wouldn't make a recommendation without an additional piece of information.
| Machine |
Cost per
Unit ($) |
Standard Deviation (mm) |
| A |
12 |
.072 |
| B |
12 |
.060 |
| C |
17 |
.056 |
| D |
10 |
.063 |
Solve the given numerical problem and illustrate step by step calculation.