Public bug reported:

I assume that you decided for uniform distribution in the random number
generator. If group of dependent packages is installed only when all
phased-update-percentage values (for each package) are smaller than the
present percentage on server - it will change probability distribution
for the whole group of packages.

Just run this:

figure(1)
hist(rand(1,100000))
for i = 2:10
        figure(i)
        hist(max(rand(i,100000)))
endfor

in octave and look at histograms for i>1 (i is the number of dependent
packages).

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1214482

Title:
  Not-grouping dependent packages in Phased Updates changes propability
  distribution for entire group of dependent packages.

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