4. "Between 1 969 and 1 976, the mean income of black men increased more rapidly than that of whites, pushing the B/W income ratio from 0.60 to 0.65." "Between 1969 and 1976, the income gap between white and black men continued to expand. In 1969, black men earned $2986 less than their white counterparts. By 1976, this white-black dollar gap had increased to $4083." Explain why both of these seemingly paradoxical statements are true.