Need help. please help. why they said 20? this is the only thing i need to know. can we say 10, 11, 12? an num

Need help. please help. why they said 20? this is the only thing i need to know. can we say 10, 11, 12? an number?



Design a simulation that can be used to estimate the probability of guessing
an answer correctly on a true or false test.

Answer: Sample answer: P(correct) = P(incorrect) = 50%. Use a coin where heads represents a correct answer and tails represents an incorrect answer. Use 20 trials.

why 20 trials? how do we know?

You're right. Any number can be used. The precision of the result improves with increasing the number of trials, but the problem doesn't specify what precision is needed, so 10 trials could be used or 42 or some other number.

if a coin is tossed 20 times you would have 2^20 outcomes.

that's what 20 means. the number of trials is 2^(n). if they said like 10 trials, it would be 2^(10) outcomes.

n really doesn't matter, because the outcomes will always be 2^(n).