when to use office hours when a professor is away from his or her office definition of random variable of office hours which random variable describes the covariance of office hours? which variable is a random variable between x and y? what is the mean of office hours what is the ra in x y how to find the covariance of office hours how to interpret the correlation between office hours and time what is the mean of office hours how many people make office hours each day covariance definition of office hours average office hours in nj what is the covariance of office hours? what is covariance of office hours how to figure covariance between office hours what is the covariance of office hours? what is the covariant for office hours what is the covariance between office hours what is the mean of office hours in math