Find probability for the given data using normal approximation.
Make use of the normal distribution to approximate the desired probability.
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 possibility of being correct 11 or more times by guessing? Does this likelihood seem to verify her claim?
a..0871, yes
b..4129, yes
c..0871, no
d..4129, no