X797: Use Gradebook object in C++

Consider already having a class called gradebook that manages a student's grades for a class, but you want to define the following member function for it:

double getAverage(); // returns the average of all the current grades

void addGrade(double grade); // adds a new grade into the gradebook

Complete the following function by: (1) creating a new gradebook, (2) adding the scores 80 and 95 to it, and (3) returning what averageGrade calculates.

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