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On any given test, there is a 41% chance that a student will get a B or better. A teacher randomly selects tests until there is a B or better. Assume the selections are independent. What is the probability
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On any given test, there is a 41% chance that a student will get a B or better. A teacher randomly selects tests until there is a B or better. Assume the selections are independent. What is the probability that it will take exactly 4 selections to get a B or better? What is the probability that it will take more than 3 selections to get a B or better?

User Justsee
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9 votes

Step-by-step explanation:

Probability of exactly 4 selections

= (100% - 41%)³(41%) = 8.42%.

Probabiluty of more than 3 selections

= (100% - 41%)³ = 20.54%.

User Dubron
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