find the variance of all nodes in a linked list in javascript

index.tsx
class Node {
  constructor(value, next) {
    this.value = value;
    this.next = next;
  }
}

class LinkedList {
  constructor() {
    this.head = null;
  }

  addNode(value) {
    const newNode = new Node(value, null);

    if (!this.head) {
      this.head = newNode;
    } else {
      let currNode = this.head;
      while (currNode.next) {
        currNode = currNode.next;
      }
      currNode.next = newNode;
    }
  }

  findMean() {
    let sum = 0;
    let count = 0;
    let currNode = this.head;

    while (currNode) {
      sum += currNode.value;
      count++;
      currNode = currNode.next;
    }

    return sum / count;
  }

  findVariance() {
    let varianceList = [];
    const mean = this.findMean();
    let currNode = this.head;

    while (currNode) {
      varianceList.push(Math.pow(currNode.value - mean, 2));
      currNode = currNode.next;
    }

    currNode = this.head;
    let varianceCount = 0;

    while (currNode) {
      currNode.variance = varianceList[varianceCount];
      varianceCount++;
      currNode = currNode.next;
    }

    return this;
  }

  printList() {
    let currNode = this.head;
    while (currNode) {
      console.log(currNode.value + ": " + currNode.variance);
      currNode = currNode.next;
    }
  }
}

const linkedList = new LinkedList();
linkedList.addNode(1);
linkedList.addNode(2);
linkedList.addNode(3);
linkedList.addNode(4);
linkedList.addNode(5);

linkedList.findVariance().printList();
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