What are the mean, variance, and standard deviation of these values?
6.9 8.7 7.6 4.8 9.0
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Find the mean. |
How can you organize you work?
Use a table to record the values.
Make a table.
The mean is 7.4. The variance is 2.26. The standard deviation is about 1.5.
Meteorology The table displays the number of U.S. hurricane strikes by decade from the years 1851 to 2000. What are the mean and standard deviation for this data set?
Decade | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Strikes | 19 | 15 | 20 | 22 | 21 | 18 | 21 | 13 | 19 | 24 | 17 | 14 | 12 | 15 | 14 |
SOURCE: National Hurricane Center
How do you know you are entering all the data values?
The calculator value for n should match the number of table values.
Step 1 | Use STAT EDIT to enter the data in list L1. |
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Step 2 | In STAT CALC select the 1–Var Stats option. |
The mean is 17.6; the standard deviation is about 3.5.