I'm in an introductory Java course and our first assignment has me stumped. It will read a series of numeric scores (integers) until -1 is read, then calculate standard deviation. We also must determine the highest score, average, and other numbers. But the catch is no arrays. I don't know how to find standard deviation without recording down the set of numbers.

Just to make sure I have the right concept of SD, don't I first have to find the mean, and then subtract it from each score? Square each number and add them up, divide by n-1, then find the square root.

sqrt{ sigma[(x - xbar)^2] / n-1}

Just to make sure I have the right concept of SD, don't I first have to find the mean, and then subtract it from each score? Square each number and add them up, divide by n-1, then find the square root.

sqrt{ sigma[(x - xbar)^2] / n-1}