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I need help with this java programming challenge:8. Grade BookassignStringarrayobjectnamescharactersarraysarray

A teacher has five students who have each taken four tests. The teacher uses the following grading
scale to   a letter grade to a student, based on the average of his or her four test scores:
Test Score Letter Grade90-100 A
80-89 B70-79 C
60-69 D0-59 F
Write a class  that uses a     or an ArrayList   to hold the five students'  ,an array  of five   to hold the five students' letter grades, and five   of fourdoubles  each to hold each student's set of test scores. You may find using a single 5x4multi-dimensional array  easier to manage instead of a separate   for each set of test scores. 
The class  should have methods  that return a specific student's name , the average test score, and a
letter grade based on the average. Although averages are often floating-point values , you should
cast the average test score to an integer  when comparing with the grading scale. This reduces the
possibility of error. Demonstrate the class  in a program  that allows the user to enter each
student's name  and his or her four test scores. It should then display each student's average test
score and letter grade.

Input Validation: Do not accept test scores less than  zero or greater than  100.

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Marks.java
java
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Grade Book A teacher has five students who have each taken four tests. The teacher uses the following grading scale to assign a letter grade to a...
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