3. An average of 0.8 accident occur per day in a particular large city.

Find the probability that no accident will occur in this city on a given day.

5. Suppose that the test results for a certain exam are normally distributed with mean of 86.5 and

standard deviation 17.

a. What is the z-value for the test result of 100?

b. What test result has a z-value of -1.8?

c. Approximately what percentage of exam takers will pass if the passing grade is 75.