Question

Please show your work to find the mean and standard deviation of the data. Round to the nearest tenth.
20, 16, 18, 14, 9, 20, 16

I know i have to add all them and divide the answer by 7. And that's my mean , But Idk how to get the standard deviation ?

Answer 1

https://www.easycalculation.com/statistics/standard-deviation.php

add up the squares of the difference between each value and the mean

divide it by 7 or 6 depending on if the population sd or just sd is desired

take the square root.

Answer 2

http://www.easycalculation.com/statistics/standard-deviation.php

Answer 3

Thank you

Answer 4

16.14