# Lesson 2E… and Row by ColumnSolidify Understanding

## Ready

Add the given matrices. If the matrices can’t be added, give a reason why not.

## Set

### 5.

Recall from today’s lesson that in a context, each entry in a matrix represents two pieces of information, depending on the row and column in which it is located. Organize the following information into a matrix, and label the rows and columns.

The following number of items were sold during the lunch rush at Fried Freddy’s Café:

• Day 1 – orders of fried chicken, orders of fish, and orders of french fries

• Day 2 – orders of fried chicken, orders of fish, and orders of french fries

• Day 3 – orders of fried chicken, orders of fish, and orders of french fries

• Day 4 – orders of fried chicken, orders of fish, and orders of french fries

• Day 5 – orders of fried chicken, orders of fish, and orders of french fries

### 6.

Find the product.

### 7.

Find the product.

### 8.

Find the product.

### 9.

Find the product.

## Go

The following data represents a random sample of boys and girls and how many prefer cats or dogs. Use the information to answer the questions.

Cats

Dogs

Total

Boys

Girls

Total

### 18.

If this is a random sample from a school, what total percent of boys in this school do you think would prefer dogs?

### 19.

What percent of students at the school would prefer cats?

### 20.

If you sampled a different 152 students, would you get the same percentages? Explain.

### 21.

What would happen to your percentages if you used a larger sample size?