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Gonzalezm7121
he is off by a little 

Diameter of Penny measured by Will using the ruler=1.9 cm

The exact measurement of Penny's Diameter can't be 1.9 cm, it can be in between [1.85 cm , 1.90 cm) or (1.90 cm,1.95 cm].

→Margin of error will be

        Between, 0 cm to 0.05 cm.

That is→ (0,0.05).

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