What is the standard deviation of the data set?

Round the answer to the nearest tenth.

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

1 answer

Here is a cute little video from the KhanAcademy
to show the basic method.

It will depend on how you were taught whether you divide by 7 or by 6.
You will have to check your notes or your textbook

https://www.khanacademy.org/math/statistics-probability/displaying-describing-data/sample-standard-deviation/v/sample-standard-deviation-and-bias