Exercise

# Standard deviation by hand

In the video, we talked about measures of variability, and discussed standard deviation as the measure that is used most commonly. It's pretty important that you have a grasp on this concept, as interviewers will likely hit on it early on in the process through a coding assignment or something more conceptual.

Here, you'll simulate this experience by **computing standard deviation** by hand, meaning that you won't use any existing functions like `std()`

to get your results.

Instructions

**100 XP**

- Without using the
`mean()`

function, compute the mean of our`nums`

list defined for you. - Use the computed
`variance`

value along with the`math.sqrt()`

function to get the standard deviation; print your result. - Check your work by printing the actual standard deviation with the
`np.std()`

function mentioned earlier.