As the exercise exemplifies, a bimodal distribution is a statistical term used to calculate different and continous probabilities between two different modes (therefore BImodal, meaning two). In this case, given that what is being analized are two modes, the students who knew the material and those who did not, a bimodal distribution would be the logical choice of statistic.
Explanation: A bimodal distribution in statistics can be defined as a distribution of all possible values of a random variable together with an indication of their probabilities that has two modes or forms.
Students who knew the material and those who did not would most likely yield a bimodal distribution because these two categories are very distinct. And bimodal meaning two modes is used in statistics to calculate different modes.
