Once again: Averages without variance have no meaning. This is why, at school, you were taught how to calculate averages at the same time as calculating varian

Once again: Averages without variance have no meaning. This is why, at school, you were taught how to calculate averages at the same time as calculating variance. The variance provides an indication of data spread and the two belong together, like fish and chips. One without the other means incorrect inferences are more likely. Like here.