last name', 'examl', 'exam the gradebook_dict in JSON format to the file grades.json. ting each student's first name (string), last name (string) and three exam scores (integers). Outp Exercise 9.4 using the json module to read the grades.json file created in the previo (Class Average: Reading a Gradebook Dictionary from a JSON File) Reimplement exercise. Display the data in tabular format, including an additional column showing each 9.7 additional ro student's average to the right of that student's three exam grades and an showing the class average on each exam below that exam's column. Deserialization) We mentioned tha