Help Correct code: $//$package Grades;

import java.util.Arrays;

import java.util.Scanner;

public class Grades $\{$

$//$ Studying values from the consumer

public static int$[]$ readGrades$()\{$

Scanner read $=$ new Scanner$($System$.$in$)$;

System.out.print$("$Input the number of grades: $")$;

int length $=$ read.nextInt$()$;

int$[]$ grades $=$ new int$[$length$]$;

for $($int i $=0$; i $$ length; i$++)\{$

System.out.print$("$Input $"+($i $+1)+"$th grade: $")$;

int grade $=$ read.nextInt$()$;

grades$[$i$]=$ grade;

$\}$

read.close$()$;

return grades;

$\}$

$//$ Calculating the sum of grades in the array

public static int sum$($int$[]$ arr$)\{$

int sum $=0$;

for $($int i $=0$; i $$ arr.length; i$++)\{$

sum $=$ sum $+$ arr$[$i$]$;

$\}$

return sum;

$\}$

$//$ Calculating the sum of grades at the first and last index

public static int sum$($int$[]$ arr, int firstIndex, int lastIndex$)\{$

return arr$[$firstIndex$]+$ arr$[$lastIndex$]$;

$\}$

$//$ Calculating the average of grades in the array

public static double average$($int$[]$ arr$)\{$

int sum $=0$;

for $($int i $=0$; i $$ arr.length; i$++)\{$

sum $=$ sum $+$ arr$[$i$]$;

$\}$

return $($double$)$ sum $/$ arr.length;

$\}$

$//$ Finding the maximum grade in the array of grades

public static int maxValue$($int$[]$ arr$)\{$

int max $=$ arr$[0]$;

for $($int i $=1$; i $$ arr.length; i$++)\{$

if $($max $$ arr$[$i$])\{$

max $=$ arr$[$i$]$;

$\}$

$\}$

return max;

$\}$

$//$ Finding the minimum grade in the array of grades

public static int minValue$($int$[]$ arr$)\{$

int min $=$ arr$[0]$;

for $($int i $=1$; i $$ arr.length; i$++)\{$

if $($min $>$ arr$[$i$])\{$

min $=$ arr$[$i$]$;

$\}$

$\}$

return min;

$\}$

$//$ Main approach

public static void main$($String$[]$ args$)\{$

int$[]$ arr;

arr $=$ readGrades$()$;

System.out.println$("$Sum: $"+$ sum$($arr$))$;

System.out.println$("$Sum of the first index and last index values: $"+$ sum$($arr$,0,$ arr.length $-1))$;

System.out.println$("$Average of grades: $"+$ average$($arr$))$;

System.out.println$("$Maximum Grade: $"+$ maxValue$($arr$))$;

System.out.println$("$Minimum Grade: $"+$ minValue$($arr$))$;

$\}$

$\}$For example, if the input is:

$2575-1$

$5,10,20,30,40,58,60,70,80,90,100,-1$

$19,15,14,33,76,46,88,78,69,79,75,73,72,-1$

$-1$

The output will be:

Enter a grade:

Enter a grade:

Enter a grade:

Number of Grades $=2$

Maximum Exam Grade $=75$

Minimum Exam Grade $=25$

Enter a grade:

Enter a grade :

Enter a grade:

Enter a grade:

Enter a grade :

Enter a grade:

Enter a grade:

Enter a grade :

Enter a grade:

Enter a grade:

Enter a grade:

Enter a grade :

Number of Grades $=11$

Maximum Exam Grade $=100$

Minimum Exam Grade $=5$

Enter a grade:

Enter a grade:

Enter a grade :

Enter a grade :

Enter a grade:

Enter a grade:

Enter a grade:

Enter a grade:

Enter a grade:

Enter a grade :

Enter a grade :

Enter a grade :

Enter a grade :

Enter a grade:

Number of Grades $=13$

Maximum Exam Grade $=88$

Minimum Exam Grade $=14$

Enter a grade: