The Grade Distribution for a Particular Statistics Exam Was Recorded

Short Answer

The grade distribution for a particular statistics exam was recorded as follows:
$$\begin{array} { | c | c | } \hline \text { Grade } & \text { Number of Students } \\\hline 90 - 100 & 10 \\\hline \text { 80- 89 } & 10 \\\hline 70 - 79 & 8 \\\hline 60 - 69 & 2 \\\hline \text { Total } & 30 \\\hline\end{array}$$ The probability that a randomly selected student received an "A" was found to be 33%.This is an example of__________________________________________________ approach to probability.