You are the Web site designer for On Campus!, an electronic portal membership Web site aimed at current college students. To attract and retain users, it is also imperative that the homepage of this site downloads quickly. Depending on the design of the home page and the load on the company's web server, the download time will wary. To check how fast the home page loads, you open a web browser on a PC at the headquarters of On Campus! And measure the download time, that is, the time it takes for the homepage to be fully displayed in the browser. Past data indicate that the mean download time is 7 seconds and the standard deviation is 2 seconds. Approximately two thirds of the download times are between 5 and 9 seconds, and bout 95% of the download times are between 3 and 11 seconds. In other words, the length of time it takes to download the homepage is distributed as a bell-shaped curve with a clustering around the mean of 7 seconds. How can you use this information to answer questions about the current home page?

1. what is the probability that the download time will be more than 9 seconds?

1. What is the probability that the download time will be between 7 and 9 seconds?

1. What is the probability that the download time will be under 7 seconds or over 9 seconds?

1. What is the probability that the download time will be between 5 and 9 seconds?

1. What is the probability that the download time will be under 3.5 seconds?

1. How much time will elapse before 10% of the downloads are complete?