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  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.

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?