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NC information

N15 round numbers and measures to an appropriate degree of accuracy (e.g. to a specified number of decimal places or significant figures); use inequality notation to specify simple error intervals due to truncation or rounding

e.g. x = 2.3 correct to 2 s.f. implies that 2.25 ≤ x < 2.35

N16 apply and interpret limits of accuracy including upper and lower bounds