Final answer:
The error in the code is that there is a typo in the calculation of the average. Instead of using the variables lowest and highest, the code uses low and high. To fix the error, the code should be updated to use the correct variable names.
Step-by-step explanation:
The error in the code is that there is a typo in the calculation of the average. Instead of using the variables lowest and highest, the code uses low and high. This will result in an error when trying to calculate the average.
To fix the error, the code should be updated to use the correct variable names:
Declare Real lowest, highest, average
Display "Enter the lowest score."
Input lowest
Display "Enter the highest score."
Input highest
Set average = lowest + highest / 2
Display "The average is ", average, "."