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Author: Adám Brudzewsky

Notebooks/ArithMean.ipynb

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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Arithmetic Mean\n",
+    "The **arithmetic mean** is the sum of a *collection of numbers* divided by the count of numbers in the collection.\n",
+    "\n",
+    "Let's say we have the collection {3,1,4,1,5}."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "collection←3 1 4 1 5"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "To find the mean, we first find the sum."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 2,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "sum←+⌿collection"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Then we find the count."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "count←≢collection"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Finally, we divide the sum by the count."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "mean←sum÷count"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "And that's our mean."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 5,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/html": [
+       "<span style=\"white-space:pre; font-family: monospace\">2.8\n",
+       "</span>"
+      ]
+     },
+     "execution_count": 5,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "mean"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Dyalog APL",
+   "language": "apl",
+   "name": "dyalog-kernel"
+  },
+  "language_info": {
+   "file_extension": ".apl",
+   "mimetype": "text/apl",
+   "name": "APL"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}