Incorrect (heavy computation in template):

// app/components/stats.gjs
import { sum, map, div, max, multiply, sortBy } from '../helpers/math';

<template>
  <div>
    <p>Total: {{sum (map @items "price")}}</p>
    <p>Average: {{div (sum (map @items "price")) @items.length}}</p>
    <p>Max: {{max (map @items "price")}}</p>

    {{#each (sortBy "name" @items) as |item|}}
      <div>{{item.name}}: {{multiply item.price item.quantity}}</div>
    {{/each}}
  </div>
</template>