The experimental probability of an event is equal to the number of times that it occurs in an experiment, divided by the number of times the experiment was conducted.
Based on the table given, there is only one instance when there is exactly one correct answer.
Because there are 20 trials for the experiment, then the probability is:
[tex]P(correct\text{ }answer=1)=\text{ }\frac{1}{20}=0.05[/tex]
So, the answer is 0.05 or 5%.
