What evidence is there that proves an equal percentage of every race and gender leads to a more profitable company (or has a higher chance of a successful exit)

What evidence is there that proves an equal percentage of every race and gender leads to a more profitable company (or has a higher chance of a successful exit)?* *Because I assume that by listing "UNDERREPRESENTED FOUNDERS" YC wishes there were 50% female founders and 50% male founders? And what about the racial makeup of founders? Is the ideal world for YC a racial make up of 20% white, 20% black, 20% asian, 20% middle eastern, and 20% other?