# Lesson 3 Y B Normal? Solidify Understanding

The enrollment at South Beach High School is

9th Grade | 10th Grade | 11th Grade | 12th Grade | Totals | |
---|---|---|---|---|---|

School Cafeteria | |||||

Off Campus | |||||

Totals |

Mariana plans to use her data to answer the following questions:

Do students prefer to eat on campus or off campus?

Is there a difference between grade levels for where students prefer to eat lunch?

### 1.

In Mariana’s sample, what percent of students prefer school lunch?

### 2.

What percent prefer to eat off campus?

### 3.

#### a.

For each grade level in her sample, determine the percent of students who prefer school lunch and the percent who prefer off-campus lunch.

9th Grade | 10th Grade | 11th Grade | 12th Grade | |
---|---|---|---|---|

Prefer School Lunch | ||||

Prefer Off Campus |

#### b.

Do you notice anything unusual?

### 4.

Based on her sample, Mariana concludes that students at South Beach High School overall like school lunch. Do you agree or disagree? Why?

A company generates a mean monthly revenue of

### 5.

Find the

### 6.

Assuming the company’s monthly revenue is **normally distributed**, what percent of the time does the company make more than this amount? Less than?

### 7.

What percent of the time does the company make between

### 8.

If the company needs to make

On the Wechsler Adult Intelligence Scale, an average IQ is

### 9.

IQ scores between

### 10.

One measure of genius is an IQ score above

### 11.

Einstein had an IQ score of

### 12.

What is the probability of an individual having a higher IQ than Einstein?

Without using technology, sketch the graph of the polynomial function with the given characteristics. Write the equation, if it’s not given.

### 13.

Degree:

Roots:

Equation:

### 14.

### 15.

### 16.

Degree:

Equation: