1.)

Data from Ivy Tech's advising center shows the wait times as a normal distribution with the average as 20 min and a standard deviation as 5 min.

Using the empirical rule, what percent of students wait between 15 and 25 minutes?

What percent wait more than 20 min?

Using the empirical rule, what is the chance that someone waits less than 5 min?

2.)

This is used for the next few questions: The rating for the new scary movie has a scale of 0 to 10. The average response was that the regular movie attendant enjoyed the movie with 8.3 points and a standard deviation of 0.5 points.

What percent of people gave the movie a 9.8 or better?

(Write answer as a percentage without a percent sign.)

3.)

Consider a computer test to indicate if you like Math 123 or dislike Math 123. If positive, you like the class and if negative you dislike the class. In a sample of 25 thousand people, 80% of the population indicated they liked the class. If the test is 85.5% accurate, what are the chances that the test showed a correct positive from all the positive results? Round your percentage to 2 decimals.