# Math Help - Standard Deviation

1. ## Standard Deviation

The paper referenced in Exercise 4.25 also gave summary quantities for sodium content (in milligrams per kilogram) of chocolate pudding made from instant mix:

2297
2401
2510
2682
2824
3068
3099
3112
3700
3959

a. Compute the mean, the standard deviation, and the interquartile range for sodium content of these chocolate puddings.

I can compute the mean and the interquartile range but how do you find the standard deviation?

2. By using the definition of "standard deviation". If $\mu$ is the mean, the standard deviation is $\sqrt{\frac{\sum_{i=1}^n (x_i- \mu)^2}{n-1}}$

3. Oiy, I know we didn't do that in class. Maybe we just used our calculators for that part, I can't remember, we're flying through everything so fast. But I don't know how to do it with just one set of numbers.

EDIT: Nevermind, found it.