The value of X is given as 700 rounded to 1.s.f State the upper and lower bound

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I have completely forgot how to do this and I wasn’t sure whether the lower bound was 600 and upper was 800. Or lower 650 and upper 750

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The appropriate bounds within which $X$ lies are $749.999\ldots$ and $650$ respectively. More precisely, we have that $$650\le X\lt 750.$$