If the distribution of means has $=10$ and ${}_{\frac{x}{b}ar}=10,$ what is the $z$ score associated with the sample mean $x_{\frac{?}{\text{b}\text{a}\text{r}}}=15?$ npossible to determine with the information provided $-1\mathrm{.}5+1\mathrm{.}50\mathrm{.}5$