# Learn Advanced Array Methods by Building a Statistics Calculator - Step 23

### Tell us what’s happening:

const getMedian = array => array.length %2 === 0
?getMean[(array.sort((a,b)=>a-b))[array.length / 2], array[array.length / 2 - 1]]
:(array.sort((a,b)=>a-b))[Math.floor(array.length / 2)];
→ code is not passed . why ?

``````<!-- file: index.html -->
<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<script src="./script.js"></script>
<title>Statistics Calculator</title>
<body>
<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>
</form>
<div class="results">
<p>
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>
<p class="bold">Mean: <span id="mean"></span></p>
<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>
<p class="bold">Median: <span id="median"></span></p>
<p>
The <dfn>mode</dfn> of a list of numbers is the number that appears most
often in the list.
</p>
<p class="bold">Mode: <span id="mode"></span></p>
<p>
The <dfn>range</dfn> of a list of numbers is the difference between the
largest and smallest numbers in the list.
</p>
<p class="bold">Range: <span id="range"></span></p>
<p>
The <dfn>variance</dfn> of a list of numbers measures how far the values
are from the mean, on average.
</p>
<p class="bold">Variance: <span id="variance"></span></p>
<p>
The <dfn>standard deviation</dfn> of a list of numbers is the square
root of the variance.
</p>
<p class="bold">
Standard Deviation: <span id="standardDeviation"></span>
</p>
</div>
</body>
</html>
``````
``````/* 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 => array.length %2 === 0
?getMean[(array.sort((a,b)=>a-b))[array.length / 2], array[array.length / 2 - 1]]
:(array.sort((a,b)=>a-b))[Math.floor(array.length / 2)];

// 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;
}
``````

User Agent is: `Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36`

### Challenge Information:

Learn Advanced Array Methods by Building a Statistics Calculator - Step 23

Hello.
What issues are you having with your code? Kindly describe it to us.

Your `getMedian` function should return the value of `median` .

You need to include a `return` statement.

Happy coding

okay … I have done … tks.

1 Like

I passed this step but can I ask…

If the array.length is 5 and you divide by 2, you get 2.5. Math.floor will round this down to 2 right? Not 3.

Welcome to the FCC forum. Yes. The Math.floor() will round down it to value 2.

1 Like

Okay, but the example says it would be 3. That’s what confused me.

I see where my thinking was going wrong. The 2nd element in the array, which is 3.

1 Like

`array = [1,2,3,4,5]`

If you use only array length divided by 2 with `Math.floor()` output will be 2. But if you use the array length as the index of the array divided by 2, output will be 3.

1 Like