# Learn Advanced Array Methods by Building a Statistics Calculator - Step 22

### Tell us what’s happening:

this is, what i have to do:
Declare a `median` variable. Using the ternary operator, check if the length of `array` is even. If the length of `array` is even, find the two middle numbers and calculate the mean of those numbers. If the length of `array` is odd, find the middle number and assign it to the `median` variable.

and this is hint i get:
If the `array.length` is even, your `median` variable should use the `getMean` function to calculate the mean of the two middle numbers. Your first argument should be the value of `sorted` at `array.length / 2` , and the second at `array.length / 2 - 1` .

i dont know where my mistake is

``````javascript
/* 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);
const median = array.length % 2 === 0 ? getMean(sorted[array.length / 2], sorted[array.length / 2 - 1]) : sorted[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 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36`

### Challenge Information:

Learn Advanced Array Methods by Building a Statistics Calculator - Step 22

i solved it, you have to be aware that the getMean function takes an Array as an argument, so use

1 Like

As uyansuat93 mentioned, since getMean takes an array, you call getMean with a two-element array containing the values of you two middle elements, e.g.

``````getMean([sorted[array.length / 2], sorted[array.length / 2 - 1]])
``````
1 Like

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