We have collected data on the total number of minutes students spend completing their Unit 2 project (due this Sunday!). Find the percent of students who complete the project in less than 2.5 hours (150 minutes), with the statistics below. For your second post, find the z-score and number of minutes that represent the 90th percentile of times, which gives the time cutoff for the 10% of students who take the longest): The times follow a normal model with a mean of 171.2 minutes and a standard deviation of 87.5 minutes.