when estimating a normal standard deviation when should a normal deviation of standard deviation be calculated? how to find standard deviations from proportions how to calculate expected standard deviation how to find expected standard deviation from proportion what is the standard deviation of the observed and chance deviations of the observed and chance deviations of the observed standard deviations how to find the standard deviation what is expected mean for standard deviation how to find the expected standard deviation from the proportion data used on a normal day how to calculate expected standard deviation how do you find expected standard deviation in a chi-square? what is the standard deviation of a sample proportion how to calculate expected standard deviation in probability how to calculate standard deviation how do you find expected standard deviation for randomness calculate expected standard deviation from proportion data average sex ratio variance how do you calculate the standard deviation of a proportion how to calculate normal error from proportional data average proportions of births per month