3. Write a Python program that will take as input from the user grades from a recent ENGR 102 quiz, save it to a file named grades . txt, and print the average quiz grade to the screen. Have your program prompt the user for the number of students first, and then take as input that many names and their corresponding scores. You may assume the user provides good input. Write your code using standard file I/O commands. Use the format shown below for your output file, which includes a header line and aligned columns