diff --git a/lab_04.ipynb b/lab_04.ipynb
index 9dd50b9..c3bd571 100644
--- a/lab_04.ipynb
+++ b/lab_04.ipynb
@@ -128,7 +128,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 151,
+   "execution_count": 4,
    "id": "ba09a0f8-27d9-456f-aeff-3980e3362d5b",
    "metadata": {},
    "outputs": [],
@@ -138,7 +138,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 233,
+   "execution_count": 5,
    "id": "a29d508a-2d9a-4d62-9ff6-7a0ecfd5eba4",
    "metadata": {},
    "outputs": [],
@@ -161,7 +161,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 166,
+   "execution_count": 6,
    "id": "579d8dda-ca39-48b1-8819-b17651029729",
    "metadata": {},
    "outputs": [
@@ -401,7 +401,7 @@
        "[800 rows x 12 columns]"
       ]
      },
-     "execution_count": 166,
+     "execution_count": 6,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -424,12 +424,12 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 164,
+   "execution_count": 7,
    "id": "c9e5e4ec-b197-450c-ae2d-318006fa0a2f",
    "metadata": {},
    "outputs": [],
    "source": [
-    "# YOUR CODE HERE!"
+    "# Your code here"
    ]
   },
   {
@@ -446,7 +446,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 173,
+   "execution_count": 8,
    "id": "9afca362-9edc-423c-981b-dc42107d5de0",
    "metadata": {},
    "outputs": [
@@ -462,7 +462,7 @@
        "Name: generation, dtype: int64"
       ]
      },
-     "execution_count": 173,
+     "execution_count": 8,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -481,7 +481,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 168,
+   "execution_count": 9,
    "id": "5fe580d0-5939-4152-9f8c-4c32d35a4479",
    "metadata": {},
    "outputs": [
@@ -495,7 +495,7 @@
        "dtype: float64"
       ]
      },
-     "execution_count": 168,
+     "execution_count": 9,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -514,7 +514,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 169,
+   "execution_count": 10,
    "id": "dc69ef53-70cd-4ae0-80e7-c9c8e28de76f",
    "metadata": {},
    "outputs": [
@@ -524,7 +524,7 @@
        "0.08125"
       ]
      },
-     "execution_count": 169,
+     "execution_count": 10,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -553,12 +553,12 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 235,
+   "execution_count": 11,
    "id": "8fbcc766-8399-4f93-a6c8-e0607250a72a",
    "metadata": {},
    "outputs": [],
    "source": [
-    "# YOUR CODE HERE"
+    "# Your code here"
    ]
   },
   {
@@ -571,12 +571,12 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 236,
+   "execution_count": 12,
    "id": "b7f910c8-3d40-49ae-b270-678734c04100",
    "metadata": {},
    "outputs": [],
    "source": [
-    "# YOUR CODE HERE"
+    "# Your code here"
    ]
   },
   {
@@ -589,12 +589,12 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 237,
+   "execution_count": 13,
    "id": "f3891188-a85f-4089-8388-d4d81c7438ad",
    "metadata": {},
    "outputs": [],
    "source": [
-    "# YOUR CODE HERE"
+    "# Your code here"
    ]
   },
   {
@@ -612,7 +612,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 180,
+   "execution_count": 14,
    "id": "12c0c6c9-c07b-4183-82f6-5e346c74aac9",
    "metadata": {},
    "outputs": [
@@ -852,7 +852,7 @@
        "[65 rows x 12 columns]"
       ]
      },
-     "execution_count": 180,
+     "execution_count": 14,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -872,7 +872,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 181,
+   "execution_count": 15,
    "id": "5d089acf-7b76-4f91-8803-42a4a9a11e3e",
    "metadata": {},
    "outputs": [
@@ -893,7 +893,7 @@
        "Name: type, Length: 800, dtype: bool"
       ]
      },
-     "execution_count": 181,
+     "execution_count": 15,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -912,7 +912,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 183,
+   "execution_count": 16,
    "id": "510fa0fc-2b38-4725-9bbf-ec57d62792be",
    "metadata": {},
    "outputs": [
@@ -1370,7 +1370,7 @@
        "789              44               46     28           6      False  "
       ]
      },
-     "execution_count": 183,
+     "execution_count": 16,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -1390,7 +1390,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 185,
+   "execution_count": 17,
    "id": "05d4c5c2-c6b4-4795-9799-c884b15445a1",
    "metadata": {},
    "outputs": [
@@ -1559,7 +1559,7 @@
        "676              95              135    105           5      False  "
       ]
      },
-     "execution_count": 185,
+     "execution_count": 17,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -1589,7 +1589,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 195,
+   "execution_count": 18,
    "id": "198cb0c6-3f43-43c2-9eee-3939c12ea537",
    "metadata": {},
    "outputs": [],
@@ -1615,7 +1615,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 196,
+   "execution_count": 19,
    "id": "8a8c1ad6-4c1e-4996-ab5e-5212dadb1851",
    "metadata": {},
    "outputs": [],
@@ -1640,7 +1640,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 194,
+   "execution_count": 20,
    "id": "315682ae-7d54-4d78-9a63-d23c83ba1576",
    "metadata": {},
    "outputs": [],
@@ -1664,7 +1664,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 198,
+   "execution_count": 21,
    "id": "069ea0ab-eff6-4985-9f46-db956fe1df91",
    "metadata": {},
    "outputs": [
@@ -1693,7 +1693,7 @@
        "Name: speed, dtype: float64"
       ]
      },
-     "execution_count": 198,
+     "execution_count": 21,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -1712,7 +1712,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 205,
+   "execution_count": 22,
    "id": "5c420c0e-b5d2-49ae-ab98-3305ee076169",
    "metadata": {},
    "outputs": [
@@ -1884,7 +1884,7 @@
        "Dragon    83.312500  112.125000   86.375000"
       ]
      },
-     "execution_count": 205,
+     "execution_count": 22,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -1904,7 +1904,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 202,
+   "execution_count": 23,
    "id": "444a580d-e70c-48a1-bf87-77f98b8c9f85",
    "metadata": {},
    "outputs": [
@@ -1931,7 +1931,7 @@
        "Name: legendary, dtype: float64"
       ]
      },
-     "execution_count": 202,
+     "execution_count": 23,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -1948,12 +1948,23 @@
    "source": [
     "#### Your turn\n",
     "\n",
-    "**1.4.0.** `income` records peoples' annual income, in the following bands. `sleep` records the average hours of sleep someone gets per night. Is there a difference in the average hours of sleep by income level?"
+    "**1.4.0.** `income` records peoples' annual income, in the following bands. `sleep` records the average hours of sleep someone gets per night. Is there a difference in the average hours of sleep by income level?\n",
+    "\n",
+    "| number | annual income, in $1000   | \n",
+    "| ------ | ----------- |\n",
+    "| 1      | Less than 10       |\n",
+    "| 2      | 10-15        |\n",
+    "| 3      | 15-20         |\n",
+    "| 4      | 20-25        |\n",
+    "| 5      | 25-35        |\n",
+    "| 6      | 35-50        |\n",
+    "| 7      | 50-75        |\n",
+    "| 8      | More than 75   |"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 211,
+   "execution_count": 24,
    "id": "75c1ac4f-3914-4c0a-a156-2e084002df66",
    "metadata": {},
    "outputs": [],
@@ -1971,7 +1982,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 213,
+   "execution_count": 25,
    "id": "d46df8a1-bbc2-45a4-9be1-cee1858cbf21",
    "metadata": {},
    "outputs": [],
@@ -1979,16 +1990,6 @@
     "# YOUR CODE HERE"
    ]
   },
-  {
-   "cell_type": "code",
-   "execution_count": 231,
-   "id": "08332242-f470-41b2-b542-b29395b3b52e",
-   "metadata": {},
-   "outputs": [],
-   "source": [
-    "people[\"education\"] = people[\"education\"].map({\"none_completed\": 1, \"high_school\": 2, \"some_college\": 3, \"college\": 4})"
-   ]
-  },
   {
    "cell_type": "markdown",
    "id": "931d602b-ddf4-4c8b-80e0-f886267cce76",
@@ -2005,7 +2006,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 238,
+   "execution_count": 26,
    "id": "5ce066fe-f81d-4b78-a394-c5c2f4dc9f46",
    "metadata": {},
    "outputs": [
@@ -2015,7 +2016,7 @@
        "<AxesSubplot:>"
       ]
      },
-     "execution_count": 238,
+     "execution_count": 26,
      "metadata": {},
      "output_type": "execute_result"
     },
@@ -2046,7 +2047,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 240,
+   "execution_count": 27,
    "id": "6ac22395-351f-45c3-8ecb-7c7469d2347a",
    "metadata": {},
    "outputs": [
@@ -2056,7 +2057,7 @@
        "<AxesSubplot:xlabel='attack', ylabel='defense'>"
       ]
      },
-     "execution_count": 240,
+     "execution_count": 27,
      "metadata": {},
      "output_type": "execute_result"
     },
@@ -2094,6 +2095,14 @@
    "metadata": {},
    "outputs": [],
    "source": []
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "ee30c851-14b1-4901-9182-4304d54d53a6",
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
diff --git a/poetry.lock b/poetry.lock
index 6bc1c0a..ab50a58 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -466,7 +466,7 @@ ui-tests = ["build"]
 
 [[package]]
 name = "jupyterlab-pygments"
-version = "0.2.1"
+version = "0.2.2"
 description = "Pygments theme using JupyterLab CSS variables"
 category = "main"
 optional = false
@@ -1007,7 +1007,7 @@ python-versions = ">=3.5"
 
 [[package]]
 name = "soupsieve"
-version = "2.3.2"
+version = "2.3.2.post1"
 description = "A modern CSS selector implementation for Beautiful Soup."
 category = "main"
 optional = false
@@ -1355,8 +1355,8 @@ jupyterlab = [
     {file = "jupyterlab-3.3.3.tar.gz", hash = "sha256:294d67126015ba397f6b1c80563deec862e47e042623851bbe2a7d870d69eb6a"},
 ]
 jupyterlab-pygments = [
-    {file = "jupyterlab_pygments-0.2.1-py2.py3-none-any.whl", hash = "sha256:05f8056a18fec9ebef01f705443d81edb16bb03d27371f23c0ae135a85a76029"},
-    {file = "jupyterlab_pygments-0.2.1.tar.gz", hash = "sha256:121da770930e348895f89d6bdfce7e7e6a8bb574162923f9c9ef5a20c61619c6"},
+    {file = "jupyterlab_pygments-0.2.2-py2.py3-none-any.whl", hash = "sha256:2405800db07c9f770863bcf8049a529c3dd4d3e28536638bd7c1c01d2748309f"},
+    {file = "jupyterlab_pygments-0.2.2.tar.gz", hash = "sha256:7405d7fde60819d905a9fa8ce89e4cd830e318cdad22a0030f7a901da705585d"},
 ]
 jupyterlab-server = [
     {file = "jupyterlab_server-2.12.0-py3-none-any.whl", hash = "sha256:db5d234955c5c2684f77a064345712f071acf7df31f0d8c31b420b33b09d6472"},
@@ -1840,8 +1840,8 @@ sniffio = [
     {file = "sniffio-1.2.0.tar.gz", hash = "sha256:c4666eecec1d3f50960c6bdf61ab7bc350648da6c126e3cf6898d8cd4ddcd3de"},
 ]
 soupsieve = [
-    {file = "soupsieve-2.3.2-py3-none-any.whl", hash = "sha256:a714129d3021ec17ce5be346b1007300558b378332c289a1a20e7d4de6ff18a5"},
-    {file = "soupsieve-2.3.2.tar.gz", hash = "sha256:0bcc6d7432153063e3df09c3ac9442af3eba488715bfcad6a4c38ccb2a523124"},
+    {file = "soupsieve-2.3.2.post1-py3-none-any.whl", hash = "sha256:3b2503d3c7084a42b1ebd08116e5f81aadfaea95863628c80a3b774a11b7c759"},
+    {file = "soupsieve-2.3.2.post1.tar.gz", hash = "sha256:fc53893b3da2c33de295667a0e19f078c14bf86544af307354de5fcf12a3f30d"},
 ]
 stack-data = [
     {file = "stack_data-0.2.0-py3-none-any.whl", hash = "sha256:999762f9c3132308789affa03e9271bbbe947bf78311851f4d485d8402ed858e"},