The mass of a certain amount of salt determined by two different persons was found to differ by 2...

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The mass of a certain amount of salt determined by two different persons was found to differ by 200 mg, one using the left pan for the weights and the other using the right pan. Which of the following statement is false?
(a) There is a zero error in the balance.
(b) The true mass of salt is the mean of the two weighings.
(c) The true mass is 100 mg less than the higher value.
(d) The true mass is 200 mg more than the lower value.

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