Afellow classmate tosses 4 coins and finds that 3 of them come up tails. which of the following is the best conclusion for her to come to?
a. she needs to keep flipping the coins until she gets a 50% in heads to determine if they are fair.
b. the coins are unfair
c. this could easily happen with a fair coin after only 4 flips
d. if she flips the coins one more, they will all come up heads