Solutions Steps 9-12 corrected

Steps 9-12 were not incorporating the 'quantity' number when doing the 'most ordered item' calculations and thus were inaccurate.  Values have been updated and corrected.

Author: freddie71010

01_Getting_&_Knowing_Your_Data/Chipotle/Exercise_with_Solutions.ipynb

@@ -362,8 +362,8 @@
     {
      "data": {
       "text/plain": [
-       "Chicken Bowl    726\n",
-       "Name: item_name, dtype: int64"
+       "Chicken Bowl    761\n",
+       "*Don't forget to include the quantity in your calculations!"
       ]
      },
      "execution_count": 139,
@@ -372,7 +372,10 @@
     }
    ],
    "source": [
-    "chipo.item_name.value_counts().head(1)"
+    "c = chipo.groupby('item_name')",
+    "c = c.sum()",
+    "c = c.sort_values(['quantity'], ascending=False)",
+    "c.head(1)"
    ]
   },
   {
@@ -392,7 +395,7 @@
     {
      "data": {
       "text/plain": [
-       "726"
+       "761"
       ]
      },
      "execution_count": 93,
@@ -401,9 +404,11 @@
     }
    ],
    "source": [
-    "mostOrd = chipo.item_name.value_counts().max() #or mostOrd = chipo[\"item_name\"].max()\n",
-    "mostOrd"
-   ]
+    "c = chipo.groupby('item_name')",
+    "c = c.sum()",
+    "c = c.sort_values(['quantity'], ascending=False)",
+    "c.head(1)"
+  ]
   },
   {
    "cell_type": "markdown",
@@ -422,11 +427,11 @@
     {
      "data": {
       "text/plain": [
-       "[Diet Coke]                                                                          134\n",
-       "[Coke]                                                                               123\n",
-       "[Sprite]                                                                              77\n",
-       "[Fresh Tomato Salsa, [Rice, Black Beans, Cheese, Sour Cream, Lettuce]]                42\n",
-       "[Fresh Tomato Salsa, [Rice, Black Beans, Cheese, Sour Cream, Guacamole, Lettuce]]     40\n",
+       "[Diet Coke]                                                                          159\n",
+       "[Coke]                                                                               143\n",
+       "[Sprite]                                                                              89\n",
+       "[Fresh Tomato Salsa, [Rice, Black Beans, Cheese, Sour Cream, Lettuce]]                49\n",
+       "[Fresh Tomato Salsa, [Rice, Black Beans, Cheese, Sour Cream]]                         42\n",
        "Name: choice_description, dtype: int64"
       ]
      },
@@ -436,7 +441,10 @@
     }
    ],
    "source": [
-    "chipo.choice_description.value_counts().head()"
+    "c = chipo.groupby('choice_description').sum()",
+    "c = c.sort_values(['quantity'], ascending=False)",
+    "c.head(1)",
+    "Diet Coke 159"  
    ]
   },
   {