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    A machine, which cuts bread dough for loaves, can be adjusted to cut dough to any specified set weight. For any set weight, m grams, the actual weights of cut dough are known to be approximately normally distributed with a mean of m grams and a fixed standard deviation of s grams.
    It is also known that the machine cuts dough to within 10 grams of any set weight.

    Estimate, with justification, a value for s.

    Got no idea. Anyone?

    A good estimate would be that alomost all dough is within 10g of the mean (either side). How many standard deviations either side of the mean contain alomost all the data ?

    go from there.

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