Giulio was just able to perceive a difference in weight when Jim removed two fo the 50 jelly beans from his plastic bag. According to Weber's Law, it is most likely that if Giulio had a jumbo bag of 100 jelly beans, the smallest number of jelly beans he could noticed removed would be

The correct answer is - 4 jelly beans.

Explanation:

Weber's law or Weber-Fechner law states that the just noticeable change in any case or sense is a constant ratio of the original stimulation which is considered or judged. In more understandable way the noteceable change would be always same as the constant ratio or proportion of the orignal case or stimulus.

For instance, Giulio is able to notice the difference in the two jelally benas difference in the 50 jeally bean bag similarly he will be able to notice change in minimum 4 number of jelly bean in 100 jeally bean bag. 2 is double in ratio as 100 is double in ratio of 50 so the stimulus and change is constant.

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