[spec] further notes on sample means and consecutive sampling

diff --git a/spec/statistics.pdf b/spec/statistics.pdf
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Binary files a/spec/statistics.pdf and b/spec/statistics.pdf differ

diff --git a/spec/statistics.tex b/spec/statistics.tex
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--- a/spec/statistics.tex
+++ b/spec/statistics.tex
@@ -85,6 +85,8 @@
 
   Sample mean is distributed with mean \(\mu\) and sd \(\frac{\sigma}{\sqrt{n}}\) (approaches these values for increasing sample size \(n\)).
 
+  For a new distribution with mean of \(n\) trials, \(\operatorname{E}(X^\prime) = \operatorname{E}(X), \quad \operatorname{sd}(X^\prime) = \dfrac{\operatorname{sd}(X)}{\sqrt{n}}\)
+
   \begin{tcolorbox}[colframe=cas!75!black, title=On CAS]
   
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