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    "# Linear Regression\n",
    "\n",
    "## Statical tools\n",
    "\n",
    "Numpy comes with some useful statistical tools that we can use to\n",
    "analyze our data.\n",
    "\n",
    "### Mean\n",
    "\n",
    "The mean is the average of a set of numbers. It is calculated by summing\n",
    "all the numbers and dividing by the count of numbers.\n",
    "\n",
    "``` python\n",
    "import numpy as np\n",
    "\n",
    "mean = np.mean([1, 2, 3, 4, 5])\n",
    "median = np.median([1, 2, 3, 4, 5])\n",
    "std = np.std([1, 2, 3, 4, 5])\n",
    "variance = np.var([1, 2, 3, 4, 5])\n",
    "```"
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