Final answer:
Jerry made more baskets, totaling 5 compared to Jenny's 4. However, Jenny performed better with a higher shooting percentage of 40% versus Jerry's 25%. The probability that Helen makes both free throws is 63.75%.
Step-by-step explanation:
The question asks who made more baskets and who performed better between Jenny and Jerry. To determine who made more baskets, we simply compare the number of baskets made by each. Jenny made 4 baskets out of 10 attempts, while Jerry made 5 out of 20 attempts. So, Jerry made more baskets.
To determine who performed better, we need to compare their shooting percentages. Jenny’s shooting percentage is 40% (4 divided by 10), while Jerry’s is only 25% (5 divided by 20). Therefore, Jenny performed better in terms of shooting efficiency.
Now, regarding Helen and her free throws, if Helen has a probability of 0.75 to make any free throw and the probability increases to 0.85 when she makes the first one, we can calculate the probability of Helen making both free throws. The probability of Helen making the first shot (C) is 0.75. Given she made the first shot, the probability of making the second shot (D) is 0.85. Thus, the probability of Helen making both free throws is 0.75 for the first shot times 0.85 for the second, which yields 0.6375 or 63.75%.