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A few years ago, the vector drawing tolerances were too tight, but they have fixed that, and the system isn't extremely rigid on sig. figs., although the instructions do often specify how many to use in numerical answers. If the students get answers outside the tolerances either they made a serendipitous (sp?) error that got them close to the right answer, or they rounded an intermediate calculation too much.
and the system isn't extremely rigid on sig. figs.,