### Home > CC4 > Chapter 11 > Lesson 11.1.1 > Problem11-6

11-6.
1. Delenn is re-examining the difference in backpacks among different grade levels at her school. Now she has collected a new random sample of 100 students to see if there are categorical relationships between carrying backpacks and graduating classes. Homework Help ✎

1. Based on her sample, what percentage of students do not carry a backpack at school?

2. If a junior is chosen, what is the probability they are carrying a backpack?

3. If a student is not carrying a backpack, what is the probability they are a junior or senior?

4. Is there a relationship between graduating class and carrying a backpack at school? Show your evidence.

What is the total number of students at Delenn's school?
What is the total number of students who do not carry a backpack?
Use those numbers to find the percentage.

Use the same method as part (a), but limit the numbers to juniors only.

$\frac{30}{39}$

Create a relative frequency table to help you answer this question.
Look at the table you created.
Which classes have a greater frequency of carrying a backpack?