# Calculation of standard deviation and variance relationship

### Population and sample standard deviation review (article) | Khan Academy

The standard deviation of the mean (SD) is the most commonly used measure of SD is calculated as the square root of the variance (the average squared deviation Interquartile range is the difference between the 25th and 75th centiles. The standard deviation is the square root of the variance. The standard deviation is expressed in the same units as the mean is, whereas the. Written another way, the same formula is as follows: E(R) = w1R1 + w2Rq + + w nRn. Example: Expected Return For a simple portfolio of two mutual funds, one.

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