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My friend was asked the following question in an interview:

There are 3 weight scales and a 10kg weight.

You weigh the 10kg on each scale 5 times (total of 15 measurements for the 3 scales), each measurement is a bit off the 10kg mark (lets say the first scale shows: 11kg, 9.4kg, 12.1kg, 10.6kg. 10.2kg).

You are suppose to choose the criteria of which scales is more accurate.

**Why is it better to use standard deviation instead of the medium or average?**

How do you create a calibration formula for the scale?

How do you create a calibration formula for the scale?

Thanks!