I need help!

Hi everyone,

Here is my situation: I have never in my life taken a statistics course. I have an exam for a position with the state of CA on 10/18. A portion of the test will be on basic statistics (mean, standard deviation, variance). I know mean, median, ratios, and other basics....I just need someone to explain how to calculate standard deviation and variance. The data set will most likely revolve around voting percentages, political opinion polls, etc. For the exam I will be allowed a basic calculator, nothing fancy.

I know this is a little beneath what you are all used to, but if anyone can give me a little help, it would be greatly appreciated.