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sammy [17]
3 years ago
11

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?
Advanced Placement (AP)
1 answer:
WINSTONCH [101]3 years ago
5 0

Explanation:

Probability of exactly 4 selections

= (100% - 41%)³(41%) = 8.42%.

Probabiluty of more than 3 selections

= (100% - 41%)³ = 20.54%.

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