Suppose Bobby and Cindy’s neighbor was in Cindy’s class and was told that he scored at the 50th percentile in his class. What was his test score?
First of all, your question has several grammatical errors:
"Bobby and Cindy's neighbor were in..."
"was told that he scored" <-- Who's "he?" Bobby, or Cindy's neighbor?
Second, your question cannot be solved because we don't have any data or other information. All we know is that "he" scored at the median test score.
Ah, sorry mate, I left the first part, It goes like this-Bobby and Cindy are in different math classes. Bobby got a 75 on his test and Cindy got a 70 (surprisingly low for children of an architect). Bobby’s class had a mean of 80 and a standard deviation of 5. Cindy’s class had a mean of 75 and a standard deviation of 10. Who did better on their test, Bobby or Cindy?
Then, In second part Suppose Bobby and Cindy’s neighbor was in Cindy’s class and was told that he scored at the 50th percentile in his class. What was his test score?