According to this study, 28.3 percent of black males, on average, were suspended at least once during a school year, nearly three times the 10 percent rate for white males. Black females were suspended more than four times as often as white females (18 percent vs. 4 percent). “As the number of suspensions for kids of all races and all grades has risen dramatically, the gap between suspension rates for blacks and whites has more than tripled—from about 3 percentage points in the 1970s to more than 10 percentage points today,” said Daniel J. Losen.
Losen, D. J., & Skiba, R. J. (2010). Suspended education urban middle schools in crisis. Bloomington, IN: Civil Rights Project. https://civilrightsproject.ucla.edu/research/k-12-education/school-discipline/suspended-education-urban-middle-schools-in-crisis/Suspended-Education_FINAL-2.pdf