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Listed below are the numbers of manatee deaths caused each year by collisions with watercraft

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Listed below are the numbers of manatee deaths caused each year by collisions with watercraft. The data are listed in order for each year of the past decade. Find the range, variance, and standard deviation of the data set. What important feature of the data is not revealed through the different measures of variation?

15   20    20     11     7       2     15

5      4     7        13    13     20    2

a) The range of sample data?

b) The standard deviation of the sample data is?

c) The variance of the sample data is 

What important feature of the data is not revealed through the different measures and variation?
A) The measures of variation reveal nothing about how the numbers of hurricanes are spread. 

B) The measures of variation do not reveal the difference between the largest number of hurricanes and the smallest number of hurricanes in the data.

 C) The measures of variation reveal nothing about the pattern over time.

 D) The measures of variation reveal no information about the scale of the data.