diff --git a/study/001_introduction-to-probability-statistics-and-random-processes/README.md b/study/001_introduction-to-probability-statistics-and-random-processes/README.md
index 16f184c..11ad8dc 100644
--- a/study/001_introduction-to-probability-statistics-and-random-processes/README.md
+++ b/study/001_introduction-to-probability-statistics-and-random-processes/README.md
@@ -2,4 +2,4 @@
 
 total pages=1007
 
-**Currently reading:** chapter 1, page 118
+**Currently reading:** chapter 1, page 153
diff --git a/study/001_introduction-to-probability-statistics-and-random-processes/ch3/end-of-chapter-problems.ipynb b/study/001_introduction-to-probability-statistics-and-random-processes/ch3/end-of-chapter-problems.ipynb
new file mode 100644
index 0000000..5ffd73b
--- /dev/null
+++ b/study/001_introduction-to-probability-statistics-and-random-processes/ch3/end-of-chapter-problems.ipynb
@@ -0,0 +1,25 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "43cc5069",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "markdown",
+   "id": "d706c044",
+   "metadata": {},
+   "source": []
+  }
+ ],
+ "metadata": {
+  "language_info": {
+   "name": "python"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}
diff --git a/study/001_introduction-to-probability-statistics-and-random-processes/ch3/example-problems.ipynb b/study/001_introduction-to-probability-statistics-and-random-processes/ch3/example-problems.ipynb
new file mode 100644
index 0000000..0fa0e69
--- /dev/null
+++ b/study/001_introduction-to-probability-statistics-and-random-processes/ch3/example-problems.ipynb
@@ -0,0 +1,51 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "206bf674",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import os\n",
+    "import sys\n",
+    "\n",
+    "import matplotlib.pyplot as plt\n",
+    "import numpy as np\n",
+    "import pandas as pd\n",
+    "import seaborn as sns\n",
+    "\n",
+    "sns.set_theme(style=\"whitegrid\", context=\"notebook\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "612bd02c",
+   "metadata": {},
+   "source": [
+    "# Chapter 3 Example Problems"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "roadmap (3.14.5)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.14.5"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}
diff --git a/study/001_introduction-to-probability-statistics-and-random-processes/ch3/notes.ipynb b/study/001_introduction-to-probability-statistics-and-random-processes/ch3/notes.ipynb
new file mode 100644
index 0000000..8c9ec7f
--- /dev/null
+++ b/study/001_introduction-to-probability-statistics-and-random-processes/ch3/notes.ipynb
@@ -0,0 +1,59 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "id": "c58309b2",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import os\n",
+    "import sys\n",
+    "\n",
+    "import matplotlib.pyplot as plt\n",
+    "import numpy as np\n",
+    "import pandas as pd\n",
+    "import seaborn as sns\n",
+    "\n",
+    "sns.set_theme(style=\"whitegrid\", context=\"notebook\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "a6732353-51d5-4478-9cf8-5834e57e5a4e",
+   "metadata": {},
+   "source": [
+    "# Chapter 3 Notes"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "9f0046c2",
+   "metadata": {},
+   "source": [
+    "## Discrete Random Variables (3.1.1 - 3.1.2)"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "roadmap (3.14.5)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.14.5"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}
diff --git a/study/001_introduction-to-probability-statistics-and-random-processes/ch4/end-of-chapter-problems.ipynb b/study/001_introduction-to-probability-statistics-and-random-processes/ch4/end-of-chapter-problems.ipynb
new file mode 100644
index 0000000..5ffd73b
--- /dev/null
+++ b/study/001_introduction-to-probability-statistics-and-random-processes/ch4/end-of-chapter-problems.ipynb
@@ -0,0 +1,25 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "43cc5069",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  },
+  {
+   "cell_type": "markdown",
+   "id": "d706c044",
+   "metadata": {},
+   "source": []
+  }
+ ],
+ "metadata": {
+  "language_info": {
+   "name": "python"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}
diff --git a/study/001_introduction-to-probability-statistics-and-random-processes/ch4/example-problems.ipynb b/study/001_introduction-to-probability-statistics-and-random-processes/ch4/example-problems.ipynb
new file mode 100644
index 0000000..1d74d04
--- /dev/null
+++ b/study/001_introduction-to-probability-statistics-and-random-processes/ch4/example-problems.ipynb
@@ -0,0 +1,51 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "206bf674",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import os\n",
+    "import sys\n",
+    "\n",
+    "import matplotlib.pyplot as plt\n",
+    "import numpy as np\n",
+    "import pandas as pd\n",
+    "import seaborn as sns\n",
+    "\n",
+    "sns.set_theme(style=\"whitegrid\", context=\"notebook\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "612bd02c",
+   "metadata": {},
+   "source": [
+    "# Chapter 4 Example Problems"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "roadmap (3.14.5)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.14.5"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}
diff --git a/study/001_introduction-to-probability-statistics-and-random-processes/ch4/notes.ipynb b/study/001_introduction-to-probability-statistics-and-random-processes/ch4/notes.ipynb
new file mode 100644
index 0000000..b3cd03a
--- /dev/null
+++ b/study/001_introduction-to-probability-statistics-and-random-processes/ch4/notes.ipynb
@@ -0,0 +1,59 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "id": "c58309b2",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import os\n",
+    "import sys\n",
+    "\n",
+    "import matplotlib.pyplot as plt\n",
+    "import numpy as np\n",
+    "import pandas as pd\n",
+    "import seaborn as sns\n",
+    "\n",
+    "sns.set_theme(style=\"whitegrid\", context=\"notebook\")"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "a6732353-51d5-4478-9cf8-5834e57e5a4e",
+   "metadata": {},
+   "source": [
+    "# Chapter 4 Notes"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "9f0046c2",
+   "metadata": {},
+   "source": [
+    "## Continuous Random Variables and their Distributions (4.0.0 - 4.0.0)"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "roadmap (3.14.5)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.14.5"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}