fixed column call, so that correct results will be shown.

Author: TakaakiFuruse

01_Getting_&_Knowing_Your_Data/Chipotle/Exercise_with_Solutions.ipynb

@@ -686,31 +686,45 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 140,
-   "metadata": {
-    "collapsed": false
-   },
+   "execution_count": 15,
+   "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
-       "21.394231"
+       "18.81142857142869"
       ]
      },
-     "execution_count": 4,
+     "execution_count": 15,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
     "chipo['revenue'] = chipo['quantity']* chipo['item_price']\n",
     "order_grouped = chipo.groupby(by=['order_id']).sum()\n",
-    "order_grouped.mean()['revenue']\n",
-    "\n",
-    "\n",
+    "order_grouped.mean()['item_price']"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 16,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "18.81142857142869"
+      ]
+     },
+     "execution_count": 16,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
     "# Or \n",
-    "\n",
-    "#chipo.groupby(by=['order_id']).sum().mean()['item_price']"
+    "chipo.groupby(by=['order_id']).sum().mean()['item_price']"
    ]
   },
   {
@@ -722,18 +736,16 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 148,
-   "metadata": {
-    "collapsed": false
-   },
+   "execution_count": 17,
+   "metadata": {},
    "outputs": [
     {
      "data": {
       "text/plain": [
        "50"
       ]
      },
-     "execution_count": 148,
+     "execution_count": 17,
      "metadata": {},
      "output_type": "execute_result"
     }