I am having trouble with standard deviation.

5. You surveyed 10 random people and asked them how many days per month they go on a walk. Calculate the mean, range, standard deviation, and variance of your sample. Interpret your results in context. Would you say there is a lot or a little variation in the data? Why? Number of (x-x) (x-x) Days 10 25 0 4 20 26 15 10