April surveyed 200 bicyclists riding on the Two Rivers Bridge and recorded the
helmet color and brand of bicycle (name-brand or generic) the cyclist was riding
Of the 80 cyclists riding name-brand bikes, 60 had black helmets. If helmet
color and brand of bicycle are independent, how many cyclists riding generic
bicycles would be expected to have black helmets?
A. 5
B. 20
C. 30
D. 90
E. 100
