To determine which classmates guessed that the baby's weight was more than 7.5 pounds, we need to compare each of their guesses to 7.5 pounds:
- Michael guessed 7 3/8 pounds, which is equal to 7.375 pounds. This is less than 7.5 pounds.
- Heather guessed 7 3/4 pounds, which is equal to 7.75 pounds. This is more than 7.5 pounds.
- Lila guessed 7 5/8 pounds, which is equal to 7.625 pounds. This is also more than 7.5 pounds.
Based on this information, the classmates who guessed that the baby weighs more than 7.5 pounds are:
- Heather
- Lila