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In an investigation into the mass required to break four samples of an oil-based plastic fibre, the mass required to break the 1st sample was 13,330 g, for the 2nd it was 2,300 g, for the 3rd it was 13,600 g & for the 4th it was 13,600 g. Why was the mean for the plastic fibre calculated using only of the 3 results?

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