Question 1042802
A quiz has 4 multiple-choice questions. Each question has 5 choices, 1 being correct and the other 4 being incorrect. Suppose you guess on all 4 questions. What is the probability of getting 3 questions right?
<pre>Use the BINOMIAL PROBABILITY formula: {{{" "[n]C[s] * p^s * q^(n - s)}}}
Probability of getting EXACTLY 3 correct: {{{highlight(highlight_green(highlight(matrix(1,3, " "[4]C[3] * (1/5)^3 * (4/5)^(4 - 3) = 4 * (1/125) * (4/5) = 16/625, or, .0256))))}}}