Find the indicated probability.
-A multiple choice test has 12 questions each of which has 5 possible answers, only one of which is correct. If Judy, who forgot to study for the test, guesses on all questions, what is the probability that she will answer
Exactly 3 questions correctly?
A) 0.283
B) 0.236
C) 0.00800
D) 0.764

Question

Quizplus · Accepted Answer

The probability of guessing a question correctly is 1/5, and incorrectly is 4/5. Using the binomial probability formula for exactly 3 correct answers out of 12, we calculate P(X=3) = C(12,3) * (1/5)^3 * (4/5)^9, which equals approximately 0.236.

Find the Indicated Probability