The time for a major exam to be completed is normally distributed with an average of 55 minutes and a standard deviation of 9 minutes. If 92% of the students completed the exam, when should the test be terminated?
"P(Z<z)=0.92 \\to z=1.405."
"\\frac{x-55}{9}=1.405."
"x=55+9*1.405\\approx 68 min."
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