Exercises on Measures of Dispersion and Position.

Please enter your name

1. Given the data set {12, 47, 79, 19, 52, 10, 72, 100, 52}, identify the range.

The range is 110.
The range is 90.
The range does not exist.


2. The data set {6, 2, 8, 2, 5, 2, 2, 3, 7, 5, 9, 5, 8, 7, 7, 2, 2, 1}, represents a list of some of the baseball scores for games played on Monday, September 1, 2000. Identify the standard deviation of the number of runs scored that day. (Note: These responses are not rounded off appropriately. Be careful to choose the correct answer based on whether or not this is population data.)
The standard deviation is 2.64.
The standard deviation is 2.56.
The standard deviation is 6.9.
The standard deviation is does not exist.


3. Given the data set of baseball scores above, identify the variance. Remember to round off appropriately.

The variance is 2.6.
The variance is 6.7.
The variance is 7.0.
The variance does not exist.


4. My Quick Basic class one semester had a final exam average of 68.4 and a standard deviation of 20.1. How many standard deviations from the mean is a final exam score of 91?

1.12 from the mean.
1.13 from the mean.
-1.12 from the mean..


5. I taught two Algebra classes one semester, a day and an evening section. On the first exam, the day class had a mean of 78 and a standard deviation of 8. The evening class had a mean of 81 and a standard deviation of 14. If a day student received a score of 80 and an evening student received a score of 87. Which student did better relative to his/her class?

The day student.
The evening student.
They performed about the same.