Which of the following are true about the variance of a random variable?
it depends on the number n of data values acquired in an experiment
it has the same units as X
it can be calculated as [ E(X*X) - u*u ], where u is the expected value of X
it depends on n-1, where n is the number of data values acquired in an experiment
it can be calculated as the square root of [ E(X*X) - u*u ], where u is the expected value of X
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