If we exclude those who have never driven, the variable fastest speed driven from our survey was approximately normal with a mean of 96 mph and a standard deviation of 31 mph.

1. Based on this data, approximately what percentage of all students have driven faster than 70 mph?
2. CHP would like to classify the top 10% of all fastest speeds as reckless. What range of speeds should receive this categorization?
3. What is the IQR of fastest driving speeds (the middle 50%) ?