The completion time for an exam is normally distributed with expected value 75 minutes and variance 12 minutes. What is the probability that a student will finish this exam in less than 70 minutes or more than 80 minutes?

Answer:14.89% or 0.1489Step-by-step explanation:First, find the z-score for both 70 and 80 minutes and their corresponding percentile.[tex]z= \frac{X - \mu }{SD} \\SD=\sqrt{V} =\sqrt{12}\\\mu =75\\z= \frac{X - 75}{\sqrt{12}}\\\\[/tex]For X = 70 minutes:[tex]z= \frac{70 - 75}{\sqrt{12}}\\z=-1.4434[/tex]This z-score is equivalent to the 7.445 th percentile, so the probability of a student finishing this exam in less than 70 minutes is 7.445%or X = 80 minutes:[tex]z= \frac{80 - 75}{\sqrt{12}}\\z=1.4434[/tex]This z-score is equivalent to the 92.555 th percentile, so the probability of a student finishing this exam in more than 80 minutes is 100- 92.555 = 7.445%Therefore, the probability (P) of a student finishing this exam in less than 70 minutes or more than 80 minutes is:P = 7.445% + 7.445% = 14.89%