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After measuring tens of thousands of rubber ducks from tens of manufacturers we, the hard hitting investigative reporters at RubaDuck, were very tired.  So we just ran the numbers on 16 ducks and here we present our results.  For the exact measurement procedure, instruments used, instrument calibration dates, etc, please contact us directly don't ask. (We don't remember).

Duck Sample Height (inches) Length (inches) Width (inches) Weight (grams) Volume (ml) Density (g/cm^3) Density
(kg/m^3)
1 5.1 5.7 3.7 175      
2 2.7 3.6 2.7 65 150 0.43 433
3 1.8 2.2 2.3 35 50 0.70 700
4 2.8 3.2 2.7 50 150 0.33 333
5 1.9 2.4 1.9 40 45 0.89 889
6 4.7 7.5 5.1 230      
7 2.7 2.7 2.2 40 75 0.53 533
8 2.7 2.6 2.1 40 75 0.53 533
9 2.6 2.7 2.1 40 75 0.53 533
10 1.5 1.7 1.7 15 25 0.60 600
11 1.8 2.2 2.4 50 50 1.00 1000
12 1.9 2.3 1.9 20 50 0.40 400
13 2 2.3 1.9 20 50 0.40 400
14 1.4 1.6 1.7 15 20 0.75 750
15 2.8 2.4 2.8 45 150 0.30 300
16 1.8 2.2 2.3 15 45 0.33 333
Average 2.5 3.0 2.5 55.9 72.1 0.55 553

Data taken November 11, 2005 by DevilDucky with Ducklips as official data recorder
 and Roger was "El Jefe" for the project.

Rubber Duck Statistics

We realize that running statistics on rubber ducks is probably some sort of blasphemy, but we took our chances and forged ahead anyhow:

Average Rubber Duck Weight:  55.9 g

Sample Standard Deviation: 58 g (107%!)

Average Rubber Duck Volume:  72.1 ml

Sample Standard Deviation: 45.2 g (63%!)

Average Rubber Duck Density: 0.55 g/cm3

Sample Standard Deviation: 0.21 g/cm3 (39%)

Conclusion

During the weeks that we were measuring and analyzing data on these rubber ducks, it became apparent that there is quite a large range of sizes and weights of rubber ducks but their density remains somewhat constant.  After much thought on the matter we have concluded that this is due to rubber ducks having a fairly consistent general nature.  A rubber duck is a rubber duck no matter how large or small, no matter how much water they can hold, or just how great they float.  Rubber Ducks come in all shapes and sizes so that they fit perfectly within their family.  Even a ten foot tall rubber duck is still a familiar and lovable guy.a

Postscript

Many thanks to Dr. Martina Arndt and her very bright students at Bridgewater State University!  We originally had an egregious error in our units and not only did they catch it, they sent us a very helpful email about it.  We had previously reported the density of rubber ducks as 0.55 g/mm3 instead of the correct 0.55 g/cm3.  The difference that one little letter makes is phenomenal.  0.55 g/cm3 is half the density of water (aside: it's appropriate that our duckie friends are less dense than water, yes?) where 0.55 g/mm3 is 500 times the density of water!  If that was true, our duckie friends would sink to the bottom of the bathtub faster than, well, something denser than the inner core of the earth!  Thanks Dr. Arndt!

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