Three-quarter-inch

0.75 inch = 1.905 centimeters.

NewguestI understand they were falling into 19 bins?

Yes.

Hello

I have one more question related to the same passage:

In another series of experiments Jahn and Dunne employed a pinball-like device that allows 9000 three-quarter-inch marbles to circulate around 330 nylon pegs and distribute themselves into 19 collecting bins at the bottom.The device is contained in a shallow vertical frame ten feet high and six feet wide with a clear gla

NewguestMaybe it means that when the marbles fall into the bins they create a shape resembling a bell-shaped curve?

That's right: more ***** in the middle bins than in the bins on the sides.

Hi

You might not want or need to know this, but it is quite an old statistical experiment, known as the Quincunx ...

http://www.mathsisfun.com/data/quincunx-explained.html

Dave

.. and here is quite an impressive picture of the experiment ...

Dave