申論題

5. You are a project manager for the MyLine website, an online service that streams movies and episodes from broadcast and cable TV series and that allows users to upload and share original video. Past data indicate that the mean download time is 7 seconds and that the standard deviation is 2 seconds. What is the probability that the video download time for the MyLine website will more than 9 seconds? What is the probability that video download time for the MyLine website will be between 5 and 9 seconds?