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

jjennylove Jan 7, 2019

#1**+2 **

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

ElectricPavlov Jan 7, 2019