There are 4 blue marbles, 5 red marbles, 1 green marble, and 2 black marbles in a bag. Suppose you select one marble at random. Find each probability

Answer 1

there are lots of possible probabilities. For each color,

P(color) = #color/#total

so

P(red) = 5/(4+5+1+2) = 5/12

do the others similarly.