SOLUTION: 1) Adrian has 3 red, 4 blue, 2 white and a black marble in his basket. He randomly chooses a marble. a) What is the probability that he chooses either a red or a black marble? b

Algebra ->  Probability-and-statistics -> SOLUTION: 1) Adrian has 3 red, 4 blue, 2 white and a black marble in his basket. He randomly chooses a marble. a) What is the probability that he chooses either a red or a black marble? b      Log On


   

Question 1162752: 1) Adrian has 3 red, 4 blue, 2 white and a black marble in his basket. He randomly chooses a marble.
a) What is the probability that he chooses either a red or a black marble?
b) He picks two marbles at random (without replacement). What is the probability that he picks a red and a white marble?
c) What is the probability that he does not pick a blue marble?

Answer by ikleyn(52831) About Me  (Show Source):
You can put this solution on YOUR website!
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In all, there are 3 + 4 + 2 + 1 = 10 marbles initially in the basket.


(a)  What is the probability that he chooses either a red or highlight%28cross%28a%29%29 the black marble?


     P = P(a read) + P(the black) = 3%2F10 + 1%2F10 = 4%2F10 = 0.4.




(b)  P = P(1st is a red)*P(2nd is a white) + P(1st is a white)*(P(2nd is a red) = %283%2F10%29%2A%282%2F9%29 + %282%2F10%29%2A%283%2F9%29 = 6%2F90+%2B+6%2F90 = 12%2F90 = 2%2F15.




(c)  I can not answer this question,

     because from the post, it is unclear, if it relates to choosing/pickaping one or two marbles.


     While experiment is described accurately in cases (a) and (b), it is not described accurately in case (c).