what is the formula to find the variance of each random variable? it can be used in _____. weight of a random variable b a average variance of random variable with weighted variance weight of random sample and correlation what is variance of random variable what is the variance in weighted random variables? what is the normal deviation and variance of the random variables variance of two random variables what is the weight of the random variable for the standard deviation what is variance of a variable what is variance formula for sigma variance of two weighted random variables what is the variance of a random variable which variable is the variance of the two random variables what is standard deviation variance mean variance of random variable what's the variance of a random variable variance of two weighted random variables if variance is 0 what does it mean? weight variance