[Fai Mao]

All professional baseball players are men

Blacks make up about 12% of the population

Assume that 15 = 50% men and 50% women so 6% of the population is black men

There are 25 men on a baseball team

25 X 0.06 = 1.5 black players per team

More than that ans they are over represented

[Henry Hnyellar]

You math is faulty. Black men still make up about 12% of the male population (using your 50/50 split).

Further, since baseball players come from around the world, the percentages of US population aren't relevant.