Question: Write a C++ program to calculate the average of an unknown number of grades as follows: Prompt the user to enter a grade each time

Write a C++ program to calculate the average of an unknown number of grades as follows: Prompt the user to enter a grade each time through the loop Update the sum and number of grades Prompt the user to enter a negative grade (as a sentinel) after the last valid grade Continue looping while the input grade is not negative

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