He track coach at a high school needs a student whose reaction time is less than 0.4 seconds to help out at track meets. All the twelfth graders in the school measured their reaction times What proportion of your sample is less than 0.4 seconds?

Estimate the proportion of all twelfth graders at this school who have a reaction time of less than 0.4 seconds. Explain your reasoning.

There are 120 twelfth graders at this school. Estimate how many of them have a reaction time of less than 0.4 seconds.

Suppose another group in your class comes up with a different estimate than yours for the previous question.
What is another estimate that would be reasonable?

What is an estimate you would consider unreasonable?