The mass of a watch glass was measured four times. the masses were
99.997 g, 100.008 g, 100.011 g, and 100.005 g. what is the average
mass of the watch glass?

The average mass of the watch glass is 100.005g.

Given that,

Now the average mass of the watch glass should be

= 100.005 g

Therefore we can conclude that the average mass of the watch glass is 100.005g.

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Explanation:

1. Sum of Measurements

2. Average mass