1. Holt Geometry 3-1 Lines and Angles  Paper for notes  Pearson 11.7  Graphing Calc.

2. Holt Geometry 3-1 Lines and Angles TOPIC: 11.7 Standard Deviation Name: Daisy Basset Date : Period: Notes Objective: Use the mean and standard deviation of data set and fit it to a normal distribution.

3. Holt Geometry 3-1 Lines and Angles Vocabulary  Measures of Variation  Variance  Standard Deviation

4. Holt Geometry 3-1 Lines and Angles  Notes 11.7  Graphing Calc.

5. Holt Geometry 3-1 Lines and Angles 1. What are the mean, variance, and standard deviation of these values? Round to 3 decimal places. 6.9 8.7 7.6 4.8 9.0

6. Holt Geometry 3-1 Lines and Angles  Mean,  Variance,    ≈  Standard deviation,  ≈ 6.9 8.7 7.6 4.8 9.0 7.4 2.260 1.503

7. Holt Geometry 3-1 Lines and Angles SummarySummarize/reflect D What did I do? L What did I learn? I What did I find most interesting? Q What questions do I still have? What do I need clarified?

8. Holt Geometry 3-1 Lines and Angles  Notes 11.7  Graphing Calc.

9. Holt Geometry 3-1 Lines and Angles 2.The table displays the number of U.S. hurricane strikes by decade from the years 1851 to 2000.

10. Holt Geometry 3-1 Lines and Angles What are the mean and the standard deviation for this data set?

11. Holt Geometry 3-1 Lines and Angles Within how many standard deviations from the mean do all of the values fall? Round to the tenths place.

12. Holt Geometry 3-1 Lines and Angles  Find the mean,. 17.6  Find the standard deviation,   . 3.5 Decade123456789101112131415 Strikes191520222118211319241714121514  ≈

13. Holt Geometry 3-1 Lines and Angles  Draw a number line.  Plot the data values and the mean.  Mark off intervals of 3.5 on either side of the mean.

14. Holt Geometry 3-1 Lines and Angles All of the values fall within __ standard deviations of the mean. 2

15. Holt Geometry 3-1 Lines and Angles Hurricane watchers can expect that the number of U.S. hurricane strikes will probably fall within __ standard deviations of the 15-decade mean. 2

16. Holt Geometry 3-1 Lines and Angles SummarySummarize/reflect D What did I do? L What did I learn? I What did I find most interesting? Q What questions do I still have? What do I need clarified?