SOLUTION: A multiple-choice quiz has 15 questions, each with 4 possible answers of which only one is correct. What is the probability that a student gets at least 1 correct answer?
Algebra ->
Probability-and-statistics
-> SOLUTION: A multiple-choice quiz has 15 questions, each with 4 possible answers of which only one is correct. What is the probability that a student gets at least 1 correct answer?
Log On
Question 1152862: A multiple-choice quiz has 15 questions, each with 4 possible answers of which only one is correct. What is the probability that a student gets at least 1 correct answer? Answer by ikleyn(52812) (Show Source):
For each of 15 questions, the probability to guess randomly the correct answer is .
The probability to answer incorrectly all 15 questions is = 0.013363
The probability to get at least 1 correct answer is the COMPLEMENT
P = 1 - = 1 - 0.013363 = 0.986637. ANSWER
