Unformatted text preview: e=.03, z=1.96 this answer gives you the number of balls so / by 50 balls a month and subtract 6, since already waited 6 monthssuppose mr jones wants to end the lunch period after about 1800 of the 2400 students have finished lunch, how long will the lunch period last?work backwards 1800/2400= .75 on z table =.67 = (xmu)/sigmacrew can begin cleaning as soon as 100 or fewer students are still eating lunch, how long will the lunch period last?work backwards again 2300/2400...
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 Spring '11
 stanley
 Probability theory, The Criterion, The Criterion Collection

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