A coin is tossed 20 times. A person, who claims to have extrasensory perception, is asked to predict the outcome of each flip in advance. She predicts correctly on 11 tosses. What is the probability of being correct 11 or more times by guessing? Does this probability seem to verify her claim?
A).0871 , yes
B).4129 , yes
C).4129 , no
D).0871 , no

Question

Quizplus · Accepted Answer

The probability of getting 11 or more correct guesses by chance is 0.4129. This is a relatively high probability, so it does not seem to verify her claim of extrasensory perception.

A Coin Is Tossed 20 Times