# IM3.7.6 Exit Ticket

- Author:
- Lind, Jon

## Gas Mileage

A normal curve is a smooth curve that is **symmetric** and **bell shaped.** Data distributions that are **mound shaped** are often modeled using a normal curve, and we say that such a distribution is **approximately normal**. One example of a distribution that is approximately normal is the distribution of compy heights from the example we did in class. Distributions that are approximately normal occur in many different settings.
For example, a salesman kept track of the gas mileage for his car over a 25-week span. The mileages (miles per gallon rounded to the nearest whole number) were
23, 27, 27, 28, 25, 26, 25, 29, 26, 27, 24, 26, 26, 24, 27, 25, 28, 25, 26, 25, 29, 26, 27, 24, 26.
1. Use technology to find the mean and standard deviation of the mileage data.

6. Describe the shape of the mileage distribution. 7. Find the proportion of the data within one standard deviation of the mean.