Year | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Number | 4 | 4 | 3 | 11 | 10 | 3 | 10 | 8 | 8 | 9 | 4 | 7 | 9 | 14 | 5 |
SOURCE: National Hurricane Center
In a data list, every value falls within some number of standard deviations of the mean. For example, if the mean is 50 and the standard deviation is 10, then a value x with
Meteorology Use the U.S. hurricane-strike data from Problem 2. Within how many standard deviations from the mean do all of the values fall?
Know | Need | Plan |
---|---|---|
The data values, their mean, and their standard deviation | The number of standard deviations from the mean that include all the data |
|
What is a good way to tell which values lie within each
Plotting the values on a number line makes it easy to see the
All of the values fall within two standard deviations of the mean. Hurricane watchers can expect that the number of U.S. hurricane strikes in a decade will probably fall within two standard deviations of the 15-decade mean.