Array promblems in java script

****1.Find Fail count,if fail count is > 0 print (NO GRADE), Find Total,Find Average,if avg>90 print GRADE A,if avg>80 print GRADE B,if avg>70 print GRADE C,if avg>50 print GRADE D,else print GRADE E

const mark = [60,50,50,50,50]
let failCount = 0;
let i = 0;
let sum = 0;
while(i<5){
sum = sum + mark[i];
if (mark[i]<50){
fCount++
}
i++;
}
let avg = sum/mark.length;

if (fCount>0){

console.log("NO GRADE")
} else {
console.log("failCount is ;",fCount);
console.log("average mark is:",avg);
console.log("total mark:",sum);
}
if (avg>=90){

console.log("A grade")
} else if(avg>=80){
console.log("B grade")
} else if (avg>=70){
console.log("C grade")
}else if (avg>=50){
console.log("D grade")
} else {
console.log("E grade")
}

output

2.the program for fail in any one subject

const mark = [30,50,50,50,50]
let failCount = 0;
let i = 0;
let sum = 0;
while(i<5){
sum = sum + mark[i];
if (mark[i]<50){
failCount++

}
i++;
}
let avg = sum/mark.length;
if (fCount>0){
console.log("NO GRADE")
} else {
console.log("failCount is ;",fCount);
console.log("average mark is:",avg);
console.log("total mark:",sum);

}
if (avg>=90){
console.log("A grade")
} else if(avg>=80){
console.log("B grade")
} else if (avg>=70){
console.log("C grade")
}else if (avg>=50){
console.log("D grade")
} else {
console.log("E grade")
}

output