Create a program to calculate grades as well as descriptive statistics for a set of test scor test scores can be entered via a user prompt or through an external file. For each student, to provide a student name (string) and a test score (float). The program will do the followings: • Assign a grade (A, B, C, D, or F) based on a student's test score. Display the grade roster as shown below:

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Variables and Constant

Constants and variables are widely used in mathematical equations and expressions. They are also commonly found in the domain of programming, where each language has its own way to differentiate between a constant and a variable. Since they have all sorts of applications, knowing their differences is a good place to start.