Home > PC3 > Chapter 12 > Lesson 12.3.2 > Problem12-147

12-147.

A student guesses randomly on four multiple-choice questions, each of which has five possible answers. What is the probability that the student gets exactly two of those answers correct?

If each question has five possible answers, $P(\text{correct}) = 0.2$.

$\left( \begin{array}{c} 4\\ 2 \end{array} \right)(0.2)^2(0.8)^2$