SOLUTION: If in an online processing web based application 200 users who had to load a file had a mean time of 120 secs in loading a file with a standard deviation of 10 secs, then the wors

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Question 903414: If in an online processing web based application 200 users who had to load a file had a mean time of 120 secs in loading a file with a standard deviation of 10 secs, then the worst case (ie “lowest” ) estimate for the number of users who have waited for more than 100 secs but less than 140 secs is
Answer by stanbon(75887) About Me  (Show Source):
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If in an online processing web based application 200 users who had to load a file had a mean time of 120 secs in loading a file with a standard deviation of 10 secs, then the worst case (ie “lowest” ) estimate for the number of users who have waited for more than 100 secs but less than 140 secs is
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z(100) = (100-120)/10 = -2
z(140) = (140-120)/10 = 2
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P(100<= x <=140) = P(-2<= z <=2) = normalcdf(-2,2) = 0.9545
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Cheers,
Stan H.
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