Throwing drawing pins (unpredictable probabilities)

 Students from 4º ESO A-B performed an experiment about probability when the odds of the elementary events are unpredictable such as when a drawing pin is thrown

This was the activity they did

Throw the drawing pins on the table, and count how many drawing pins are up and how many are down .

Complete the following table:

 

DRAWING PINS
	Frequency	Relative frequency
Up
Down

 

1. Assign probabilities to the up and the down drawing pin.

We think that the probability of having the drawing pin up should be ____ and down should be ______. For these numbers we have used ___________________

 

2. Can you use Laplace’s rule? Why?

We can/can’t use Laplace rule because we think that to have the drawing pin up or down is/ isn’t equally likel

And you can see below their results

The conclussion is that the probability of having an up drawing pin is 2/3 and down drawing pin is 1/3