Final answer:
To complete the program, read numbers from a file and calculate the numerical average.
Step-by-step explanation:
To complete this program, you will need to read the numbers from the file "numbers.txt" using file I/O operations in C++. Start by including the necessary header files and then declare a variable to store each number as you read it from the file. Use a loop to repeatedly read each number until you reach the end of the file. Keep track of the sum of all the numbers and a counter for the total count of numbers. Finally, calculate the average by dividing the sum by the count. Display the average on the console.