freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-javascript/694596b0585c11170ac7c7fd.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
694596b0585c11170ac7c7fd	Challenge 165: Class Average	28	challenge-165

--description--

Given an array of exam scores (numbers), return the average score in form of a letter grade according to the following chart:

Average Score	Letter Grade
97-100	"A+"
93-96	"A"
90-92	"A-"
87-89	"B+"
83-86	"B"
80-82	"B-"
77-79	"C+"
73–76	"C"
70-72	"C-"
67-69	"D+"
63-66	"D"
60–62	"D-"
below 60	"F"

Calculate the average by adding all scores in the array and dividing by the total number of scores.

--hints--

getAverageGrade([92, 91, 90, 94, 89, 93]) should return "A-".

assert.equal(getAverageGrade([92, 91, 90, 94, 89, 93]), "A-");

getAverageGrade([84, 89, 85, 100, 91, 88, 79]) should return "B+".

assert.equal(getAverageGrade([84, 89, 85, 100, 91, 88, 79]), "B+");

getAverageGrade([63, 69, 65, 66, 71, 64, 65]) should return "D".

assert.equal(getAverageGrade([63, 69, 65, 66, 71, 64, 65]), "D");

getAverageGrade([97, 98, 99, 100, 96, 97, 98, 99, 100]) should return "A+".

assert.equal(getAverageGrade([97, 98, 99, 100, 96, 97, 98, 99, 100]), "A+");

getAverageGrade([75, 100, 88, 79, 80, 78, 64, 60]) should return "C+".

assert.equal(getAverageGrade([75, 100, 88, 79, 80, 78, 64, 60]), "C+");

getAverageGrade([45, 48, 50, 52, 100, 54, 56, 58, 59]) should return "F".

assert.equal(getAverageGrade([45, 48, 50, 52, 100, 54, 56, 58, 59]), "F");

--seed--

--seed-contents--

function getAverageGrade(scores) {

  return scores;
}

--solutions--

function getAverageGrade(scores) {
  const avg =
    scores.reduce((sum, score) => sum + score, 0) / scores.length;

  if (avg >= 97) return "A+";
  if (avg >= 93) return "A";
  if (avg >= 90) return "A-";

  if (avg >= 87) return "B+";
  if (avg >= 83) return "B";
  if (avg >= 80) return "B-";

  if (avg >= 77) return "C+";
  if (avg >= 73) return "C";
  if (avg >= 70) return "C-";

  if (avg >= 67) return "D+";
  if (avg >= 63) return "D";
  if (avg >= 60) return "D-";

  return "F";
}