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Answer to Question #55335 in Statistics and Probability for Mimi
Question #55335
10 red marbles and 10 blue marbles are placed into a bag. Alex mixes up the bag and randomly selects a marble. He continues to do so, replacing the marble after each selection, until a red marble is selected.
a. What is the probability that the first time that a red marble is pulled is on Alex’s 6th try?
b. On average, how many marbles will Alex have to pull in order to get a red marble? (Hint: use math expectation)
a. What is the probability that the first time that a red marble is pulled is on Alex’s 6th try?
b. On average, how many marbles will Alex have to pull in order to get a red marble? (Hint: use math expectation)
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