Learn Advanced Array Methods by Building a Statistics Calculator - Step 26

Tell us what’s happening:

i dont know what im doing wrong here. i have been on this too long. this is my second attempt at help

Your code so far

<!-- file: index.html -->
<!DOCTYPE html>
<html lang="en">
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <link rel="stylesheet" href="./styles.css" />
    <script src="./script.js"></script>
    <title>Statistics Calculator</title>
    <h1>Statistics Calculator</h1>
    <p>Enter a list of comma-separated numbers.</p>
    <form onsubmit="calculate(); return false;">
      <label for="numbers">Numbers:</label>
      <input type="text" name="numbers" id="numbers" />
      <button type="submit">Calculate</button>
    <div class="results">
        The <dfn>mean</dfn> of a list of numbers is the average, calculated by
        taking the sum of all numbers and dividing that by the count of numbers.
      <p class="bold">Mean: <span id="mean"></span></p>
        The <dfn>median</dfn> of a list of numbers is the number that appears in
        the middle of the list, when sorted from least to greatest.
      <p class="bold">Median: <span id="median"></span></p>
        The <dfn>mode</dfn> of a list of numbers is the number that appears most
        often in the list.
      <p class="bold">Mode: <span id="mode"></span></p>
        The <dfn>range</dfn> of a list of numbers is the difference between the
        largest and smallest numbers in the list.
      <p class="bold">Range: <span id="range"></span></p>
        The <dfn>variance</dfn> of a list of numbers measures how far the values
        are from the mean, on average.
      <p class="bold">Variance: <span id="variance"></span></p>
        The <dfn>standard deviation</dfn> of a list of numbers is the square
        root of the variance.
      <p class="bold">
        Standard Deviation: <span id="standardDeviation"></span>
/* file: styles.css */
body {
  margin: 0;
  background-color: rgb(27, 27, 50);
  text-align: center;
  color: #fff;

button {
  cursor: pointer;
  background-color: rgb(59, 59, 79);
  border: 3px solid white;
  color: white;

input {
  background-color: rgb(10, 10, 35);
  color: white;
  border: 1px solid rgb(59, 59, 79);

.bold {
  font-weight: bold;
/* file: script.js */
const getMean = (array) => array.reduce((acc, el) => acc + el, 0) / array.length;

// User Editable Region

const getMedian = (array) => {
  const sorted = array.sort((a, b) => a - b);
  if(sorted.length % 2 === 0) {
    const midNumber1 = sorted[sorted.length / 2];
    const midNumber2 = sorted[(sorted.length / 2) - 1];
    const evenNumberMedian = getMean([midNumber1, midNumber2])
    return evenNumberMedian
  }else (sorted.length % 2 === 1) {
    const oddNumberMedian = sorted[Math.floor(sorted.length / 2)]
    return oddNumberMedian

// User Editable Region

const calculate = () => {
  const value = document.querySelector("#numbers").value;
  const array = value.split(/,\s*/g);
  const numbers = array.map(el => Number(el)).filter(el => !isNaN(el));
  const mean = getMean(numbers);

  document.querySelector("#mean").textContent = mean;

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Challenge Information:

Learn Advanced Array Methods by Building a Statistics Calculator - Step 26

Hey, change the else to else if and add one more curly bracket to the bottom. Happy Coding!

1 Like

hi there!
you did not need to caculate the mean of the array from the start. use the getMean function and do the calculation as the argument of getMean function.