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avatar+922 

What is the standard deviation of the data set?

5, 9, 11, 4, 8, 9, 12

Round the answer to the nearest tenth.

 

2.7

2.9

3.0

8.2

 

I think it is 2.7

 Jan 7, 2019
 #1
avatar+18446 
+1

First find the mean of the list of numbers

5 + 9 + 11 +4 +8 + 9 + 12   /  7    = 8.286   

Now subtract the mean from each number

-3.286    .714    2.714    -4.286   -.286   .714   3.714       Now square all of these numbers   

                                    then add that together   and find the mean

                                               then  take the square root to find

      S.D. = 2.7

 Jan 7, 2019

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