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 student completed the exam, when should the test be terminated?
Mean( ) = 55
Standard deviation( )= 9
According to question, P(z) = 0.92
Using Standard Normal Distribution Chart
z= 1.405
By normal distribution formula,
Hence the test will be terminated after 67.6 minutes.
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