The time required to finish a test in normally distributed with a mean of 80 minutes and a standard deviation of 15 minutes what is the probability That a student chosen at random will finish the test in more than 110 minutes

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Alma

2 August, 05:54

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Dutches · Answer 1

Let the time taken to f, inish the test be x.

P (x > 110) = 1 - P (x < 110) = 1 - P (z < (110 - 80) / 15) = 1 - P (z < 2) = 1 - 0.9773 = 0.0227