mathematics
posted by latoya .
a drinks machine dispenses coffee into cups. A sign on the machine indicates that each cup contains 50 ml of coffee. the machine actually dispenses a mean amount of 55ml per cup and 10% of the cups contain less than the amount stated on the sign. assuming that the amount of coffee dispensed into each cup is normally distributed find the standard deviation of the amount of coffee dispensed per cup in ml.

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http://davidmlane.com/hyperstat/z_table.html
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