Final answer:
The original question about Sam's free throws lacks sufficient information to calculate an exact number. However, by analyzing Helen's scenario, where she makes 75% of her free throws, we can calculate the expected number of successful shots she might make out of two attempts, which is 1.5 on average.
Step-by-step explanation:
The question does not provide the exact number of free throws attempted by Sam within the first 27 minutes of his basketball game. However, we can analyze Helen's free throw probability to understand how probabilities work for such questions. Helen has a free throw percentage of 75%, and she is going to attempt two free throws.
Let's calculate the probability of Helen making her first free throw. The event C represents Helen making the first shot, and since her success rate is 75%, we can conclude that the probability of event C is 0.75, or 75%.
If we want to determine how many free throws Helen is expected to make out of two attempts given her success rate, we would use her shooting percentage. The number of successful shots is the product of the number of attempts and her free throw percentage. For two attempts, we expect Helen to make 1.5 shots on average (2 attempts × 75% success rate).