|
|
Chapter 10—Probability and Statistics 10-2 Statistics
| When you complete the work for this section, you should be able to: | Gathering Data Average, or Mean, Values | Definition | The average, or arithmetic mean, of a group of numbers is the center point of all those number values. | | Notes - Average and arithmetic mean are simply two different terms for the same thing.
- Arithmetic mean is pronounced as ar-ith-MET-ik, and not as ar-ITH-me-tik.
- Arithmetic mean is often spoken more simply as the mean.
| | | | Procedure To find the average, or arithmetic mean, of a set of numbers: - Add the given values
- Divide the sum by the number of values.
| Examples of Calculating Averages Examples and Exercises Determine the average, or mean, value of the set of numbers shown here. - Show all you work on a sheet of paper.
- Continue the exercises until you can work them without making mistakes.
| | Working with Median Values | Definition The median value is the exact middle value of a set of numbers. | | Procedure To find the median value of a set of numbers: When there is an odd number of values, - Arrange the numbers in numerical order.
- Find the value in the middle of the list.
That value is the median value | 
Odd number of values | When there is an even number of values, - Arrange the numbers in numerical order.
- Locate the two middle numbers in the list.
- Find the average of those two middle values.
That is the median value | 
Even number of value | | Example Examples and Exercises Determine the median value for data having an odd number of values. - Show all you work on a sheet of paper.
- Continue the exercises until you can work them without making mistakes.
| | Example Examples and Exercises Determine the median value for data having an even number of values. Round the result to the nearest 10th (1 decimal place), - Show all you work on a sheet of paper.
- Continue the exercises until you can work them without making mistakes.
| |
|
