Electrical and Electronics Measurements Basic Characteristics of an Instrument

A current of 100 A was measured three times by an ammeter and the values were indicated as 100.3 A, 100.5 A and 100.4 A. What is the precision of the ammeter ? 

1
± 0.4%
2
± 0.2%
3
± 0.1%
4
± 0.3%

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