Question: In order to choose between two measuring instruments A and B, each instrument was used to measure the diameters of 18 coins. Instrument A gave

In order to choose between two measuring instruments A and B, each instrument was used to measure the diameters of 18 coins. Instrument A gave the following measurements in centimetres: 3.53, 3.54, 3.55, 3.52, 3.54, 3.51, 3.54, 3.56, 3.53 3. 54, 3.53, 3.55, 3.52, 3.53, 3.55, 3.54, 3.55, 3.53 a) Using an assumed mean of 3.54cm, calculate the mean and the standard deviation of these measurements. b) Instrument B gave the same mean as A but its standard deviation was 0.0107cm, which of these two instruments is better? Give reasons for your

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