Lesson A.7c Task 41 Study Snacks
1. In "Just ACT Normal", you learned that the 68-95-99.7 rule. Use the rule to answer the following
problems:
1. What percentage of students scored below 21?
84%
2. About what percentage of students scored above 16?
3. Ahout what percentage of students scored between 11 and 26?
1. Your friend, Calvin, would like to go to a very selective college that only admits the top 1% of all
student applicants. Calvin has good grades and scored 33 on the test. Do you think that Calvin's ACT
score gives him a good chance of being admitted? Explain your answer.
1. Many students like to eat microwave popcorn as they study for the ACT. Microwave popcorn
producers assume that the time it takes for a kernel to pop is distributed normally with a mean of 120
seconds and a standard deviation of 13 for a standard microwave oven. If you're a devoted popcorn
studier, you don't want a lot of unpopped kernels, but you know that if you leave the bag in long
enough to be sure that all the kernels are popped, some of the popcorn will burn. How much time
would you recommend for microwaving the popcorn? Use a normal distribution curve and the
features of a normal distribution to explain your answer.
