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Update stats-for-sysadmins.md

David Stark committed 2020-05-23 20:55:19 +0100 commit e492a6e8732ea9781b1594c44c066822a78c8cc5

				compute/stats-for-sysadmins.md
			
          @@ -10,6 +10,11 @@ From <https://theartofmachinery.com/2020/01/27/systems_programming_probability.h

           If you throw n balls into n buckets at random, a bit over a third of the buckets will be empty, a bit over a third will have one ball, and the remaining quarter or so will have multiple balls.

          +### Time to double

          +From <https://web.stanford.edu/class/ee204/TheRuleof72.html>

          +

          +If you've got a thing growing a X% per day, it'll take 72/X days to double in size, roughly.

          +

           ### Scale up, or scale out?

           From <http://people.brunel.ac.uk/~mastjjb/jeb/or/queue.html>

...	...	@@ -10,6 +10,11 @@ From <https://theartofmachinery.com/2020/01/27/systems_programming_probability.h
10	10
11	11	If you throw n balls into n buckets at random, a bit over a third of the buckets will be empty, a bit over a third will have one ball, and the remaining quarter or so will have multiple balls.
12	12
	13	+### Time to double
	14	+From <https://web.stanford.edu/class/ee204/TheRuleof72.html>
	15	+
	16	+If you've got a thing growing a X% per day, it'll take 72/X days to double in size, roughly.
	17	+
13	18	### Scale up, or scale out?
14	19	From <http://people.brunel.ac.uk/~mastjjb/jeb/or/queue.html>
15	20