- A box contains only blue and black glass beads. The probability of randomly choosing a
blue bead out of the box is 3 times the
probability of randomly choosing a black bead
out of the box. If there are 12 beads in the box,
how many are blue?
A. 3
B. 4
C. 6
D. 9

D.

Explanation:

Blue beads are 3 times more likely to be pulled. Therefore, since there are 12 beads in total the ratio which would fit the ratio of probability to pull blue beads compared to black beads would be 9/12 leaving 3/12 probability to pull a black bead. if you simplify the fractions you get 3/4 and 1/4 where 1/4 (the probability to pull a black bead) is three times less than the probability to pull a blue bead.

b. shallow would be my guess

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