5.3 35 blue 15 green


Probability as relative frequency is introduced by having students blind pull a marble from a bag with 35 blue marbles and 15 green marbles. 


With 18 students in attendance the sample relative frequency/probability results were almost unnaturally close to the population probability. 

This example is clear enough, but obtaining relative frequency based probabilities from ratio level data could use a good example. Both the car speeds and height data are rather clearly interval level data - no fractional data exists in the data set. Perhaps marble masses? Of the 18 marbles? That would be ratio level. That would lead to a four class histogram which could then be used to discuss the way the class upper limit is handles in ratio level data.

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