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the newsstand at corner of bloor and yonge finds that the number of papers sold each day follows a normal probability distribution with a mean

the newsstand at corner of bloor and yonge finds that the number of papers sold each day follows a normal probability distribution with a mean of 900 copies an d a standard deviation of 150 copies. How many copies should the owner of the newsstand order so that they only run out of papers on 20% of the days?

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