A box contains 6 red marbles, 10 white marbles, and 14 blue marbles. If a marble

Question

A box contains 6 red marbles, 10 white marbles, and 14 blue marbles. If a marble is randomly selected from the box, what is the probability that it is red or white? 16/30 18/30 12/30 14/30 16/14 Find the probability or percent of the event described. In one city, 52.2% of adults are female, 99% of adults are left-handed, and 52% are left-handed females. For an adult selected at random from the city, let F= event the person is female L = event the person is left-handed. 0.569 0.517 0.720 0.621 0.6732 A coin is tossed 4 times. What is the probability of getting all tails? 15/16 1/4 1/32 1/16 31/32

Explanation / Answer

16)

6 Red marbles, 10 White Marbles and 14 Blue marbles

Selecting a marble at random can be done in 30C1 ways

Probability of selecting a red marble is 6C1/30C1 = 6/30

Probability of selecting a white marble is 10C1/30C1 = 10/30

Probability that selected marble is red or white is 6/30 + 10/30 = 16/30 (Option A)

(17)

P(F) = 0.522

P(L) = 0.099

P(F and L) = 0.052

P(F or L) = P(F) + P(L) - P(F and L) = 0.522 + 0.099 - 0.052 = 0.569 (Option A)

(18)

Probability of getting all tails = (1/2)^4 = 1/16 (Option D)

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