in a population of mice individuals with medium brown fur are less likely to be seen by predators than light brown and dark brown mice what type of selection is this and what would the distribution curve for the mass population look like

This is an example of stabilizing selection. Stabilizing selection favors the middle range of traits, while extremes are selected against. In this case, mice with medium brown fur have a better chance of survival and reproduction, while lighter and darker brown mice are more vulnerable to predation. Therefore, the distribution curve would be a bell-shaped curve with the highest frequency of individuals in the middle range of brown fur color, and decreasing frequencies towards both light and dark ends of the spectrum.