In a diving event, each participant has a 25% probability of executing a flawless dive. Only the first flawless dive in the event will earn a perfect score, while any subsequent dives will not. If Lisa is the fourth participant to dive, what is her probability of achieving a perfect score?
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thank you very much!
Great
i got 1/4 first and felt great about it lol. then reread the question...
haha same, forgot the three people ahead of her entirely
who else landed on C by accident? i think i combined two fractions wrong somewhere
C is the classic trap, they know people will mess up the multiplication
What it tests
Your ability to compute probabilities of single and compound events, including 'at least one' questions.
Common trap
Forgetting to use the complement for 'at least one', or treating dependent events as independent.