SubTotals.php

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<?php
namespace Magento\Backend\Model\Widget\Grid;

class SubTotals extends \Magento\Backend\Model\Widget\Grid\AbstractTotals
{
    protected function _countSum($index, $collection)
    {
        $sum = 0;
        foreach ($collection as $item) {
            $sum += $item[$index];
        }
        return $sum;
    }

    protected function _countAverage($index, $collection)
    {
        $itemsCount = count($collection);
        return $itemsCount ? $this->_countSum($index, $collection) / $itemsCount : $itemsCount;
    }
}