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

Question

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] · Answer 1 · 2022-03-08T11:49:24+03:00

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%.