Fixed solution

Mission177Solutions.ipynb

@@ -157,7 +157,7 @@
    "source": [
     "avg_closing_prices = {}\n",
     "\n",
-    "for stock_sym in stock_symbols:\n",
+    "for stock_sym in stock_prices:\n",
     "    avg_closing_prices[stock_sym] = stock_prices[stock_sym][\"close\"].mean()"
    ]
   },
@@ -741,7 +741,7 @@
     }
    ],
    "source": [
-    "for stock_sym in stock_symbols:\n",
+    "for stock_sym in stock_prices:\n",
     "    print(stock_sym, avg_closing_prices[stock_sym])"
    ]
   },
@@ -772,7 +772,7 @@
     }
    ],
    "source": [
-    "pairs = [(avg_closing_prices[stock_sym], stock_sym) for stock_sym in stock_symbols]\n",
+    "pairs = [(avg_closing_prices[stock_sym], stock_sym) for stock_sym in stock_prices]\n",
     "\n",
     "pairs.sort()\n",
     "\n",
@@ -816,7 +816,7 @@
    "source": [
     "trades_by_day = {}\n",
     "\n",
-    "for stock_sym in stock_symbols:\n",
+    "for stock_sym in stock_prices:\n",
     "    for index, row in stock_prices[stock_sym].iterrows():\n",
     "        day = row[\"date\"]\n",
     "        volume = row[\"volume\"]\n",