do exponential family distributions always contain mean and variance? what type of exponential family is a n/a which exponential family has the mean and variance? does the mean and variance always exist do the mean and variance of an exponential family distribution always exist does an exponential family always exist which parameter of an exponential family is a random variable? do the mean and variance always exist do the variance and mean always exist? do the mean and variance always exists do mean and variance always exist in exponential family do the means and variance always exist do scalar distributions always have a mean and variance if the average mean and variance do not always exist, which type of exponential family distribution is a scalar random variable does the variance of an exponential family always exist does the mean of each exponential family always exist? does the mean of the exponential family always exist? do the variance and mean always exist for exponential family what are the mean and variances for exponential family distributions do mean and variance always exist for exponential distributions