Question

Jennifer flipped a pair of coins 60 times. On 24 occasions, heads appeared on both coins. How is this outcome different from the expected outcome?

Answer 1

The probability of getting a head on one flip of a fair coin is 1/2. The probability of getting heads with a pair of fair coins is 1/2 * 1/2 = 1/4.
The expected number of occasions of getting heads on both coins when flipping the pair 60 times is 60 * (1/4) = 15 which is much lower than the experimental number of 24. There is a possibility that one or both coins are biased.