Statistics

I took statistics freshmen year, so it has been three years. I do not remember much, but I do remember doing probabilities, means, medians, range, standard deviations, and standard error. I know probability has to do with the odds of somethig occuring. I remember there were different ways to caculate the probabilities based off of what the question was asking. I also remember looking at sets of numbers and calculating the mean and determining the range and median of the given values. I also remember finding standard deviation and standard errors. I remember that you have to use standard error to caclulate standard deviation. I also do not specifically remember the equation for standard deviation, but I remember it being long. I also remember that the standard deviation tells how far off a number is from the mean (I think I'm not positive).