diff --git a/elementary-statistics/.Rhistory b/elementary-statistics/.Rhistory
index 275a17c..f80727a 100644
--- a/elementary-statistics/.Rhistory
+++ b/elementary-statistics/.Rhistory
@@ -356,3 +356,12 @@ boxplot(duration, horizontal=TRUE)
 boxplot(interval, horizontal=TRUE)
 q
 q()
+var(duration)
+var(interval)
+max(interval) - min(interval)
+sd(duration)
+sd(interval)
+waiting
+interval == waiting
+cov(duration, waiting)
+q()