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 14 tosses. What is the
Probability of being correct 14 or more times by guessing? Does this probability seem to
Verify her claim? Use the normal distribution to approximate the desired probability.
A)0.4418, no
B)0.4418, yes
C)0.0582, no
D)0.0582, yes

Question

Quizplus · Accepted Answer

The probability of guessing correctly 14 or more times out of 20 by chance is approximately 0.0582, which is relatively low, suggesting that the result could be due to something other than random guessing, but it does not strongly verify her claim of extrasensory perception.

A Coin Is Tossed 20 Times