Does anyone know what code to get the sample mean?

{r} \# 1oading the data from where it is stored on a website vole = TRUE) These data are from a famous animal behavior study that tried to explain the genetic basis expression of a gene related to activity of the hormone vasopressin. Our data frame, vole of a "control" vole where nothing was changed, or of an "enhanced" vole that had artificial" spend huddled next to a partner. This is used to measure monogamy/pair bonding, with a highe 1. (2 points) Looking only at the "control" voles, what is the sample mean? {r}