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 95 minutes?
The z-score for 95 minutes is: [tex]z=\frac{X-\mu}{\sigma}=\frac{95-80}{15}=1[/tex] Reference to a standard normal distribution shows that the required probability is approximately 0.16 or 16%.
