average out (to)
1. To calculate the median number of a set of figures. In this usage, a noun can be used between "average" and "out." You need to average out your expenses and make a budget for yourself. I haven't averaged the kids' test scores out yet, but I don't think it will be a very high number, as most of them failed.
2. To reach an amount that is indicative of an overall situation (rather than the occasional high or low points). In this usage, "to" is commonly part of the phrase. I've had both high and low test scores this semester, but I think it will average out to a decent overall grade.