Ch4, Ex.1: Explicitly name the scale argument in stats.expon()

In scipy 0.12.0, the first unnamed argument becomes the location of the distribution. As such, the starter code gives the reader an Exp(1) distribution starting at x=4.

Author: mbauman

Chapter4_TheGreatestTheoremNeverTold/LawOfLargeNumbers.ipynb

@@ -1038,7 +1038,7 @@
      "input": [
       "## Enter code here\n",
       "import scipy.stats as stats\n",
-      "exp = stats.expon( 4 )\n",
+      "exp = stats.expon( scale=4 )\n",
       "N = 1e5\n",
       "X = exp.rvs( N )\n",
       "## ..."
@@ -1170,4 +1170,4 @@
    "metadata": {}
   }
  ]
-}
+}