Sx shows the standard deviation for a sample, while σx shows the standard deviation for a population. ... A lower standard deviation value means that the values in your list don't vary much from the mean, while a higher value means your data is more spread out. x̄ represents the mean, or average, of the values. Σx represents the sum of all values.
Standard Deviation is calculated by the following steps: Determine the mean (average) of a set of numbers. Determine the difference of each number and the mean Square each difference Calculate the average of the squares Calculate the square root of the average.
Understanding STDEV Add together all the cash flows you have put in the spreadsheet to calculate a total. Divide the total by the number of historical entries to calculate the mean average cash flow. Subtract the mean average cash flow from each recorded cash flow to calculate the difference. ... Square each cash flow difference by multiplying it against itself. ...
Expected Return for Portfolio = 50% * 15% + 50% * 7% Expected Return for Portfolio = 7.5% + 3.5% Expected Return for Portfolio = 11%
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