A physics teacher asked for students to find the average mass of a coin, given 8 similar coins and a beam balance. The procedure they used was to measure the mass, in grams, of one coin, then add each coin and find the new total mass. (a) State TWO likely sources of error and one precaution

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A: The given values are, LC=0.1 cml=11.2 cmw=7.5 cmh=5.4 cm