Question

Let A and B be two independent events such that P(A) = 0.17 and P(B) = 0.63. What is P(A or B)? Your answer should be given to 4 decimal places.

An urn contains 27 red marbles, 20 blue marbles, and 42 yellow marbles. One marble is to be chosen from the urn without looking.

What is the probability of choosing a red or a blue marble?

Your answer should be rounded to 4 decimal places.

Answer 1

Answer 1

Let A and B be two independent events such that P(A) = 0.17 and P(B) = 0.63.

P(A or B)

= P(A) + P(B) - P(A and B)

= P(A) + P(B) - P(A)*P(B)

= 0.17 + 0.63 - 0.17*0.63

= 0.6929

Answer 2

An urn contains 27 red marbles, 20 blue marbles, and 42 yellow marbles. One marble is to be chosen from the urn without looking.

P(choosing red or blue marble)

= P(red) + P(blue)

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