The purpose of this Warm-up is for students to compute the fraction of individuals whose responses fall in a specified category. This activity gives students time to think about how to compute these fractions from categorical data.

For the last two questions, students may debate whether to include the 10-minute times or not. According to the wording of the question asked, it does ask for more-than-10-minute times, so maybe exactly 10 minutes should not count (because 10 is not greater than 10). On the other hand, all of the values are listed as whole numbers, so a student who takes 10 minutes and 1 second to get to school may have rounded down to 10, but should have been counted. Noticing the large difference in answers for the third question, it may be worth clarifying the data in this instance, even for an estimate.

Monitor for students who include the 10-minute times for the last two questions as well as those who do not.