2. A student answers a multiple-choice question either by knowing the answer or by guessing. The probability that the student knows the answer is 40%. If the student guesses, he has 5 possi- ble choices in the multiple-choice question. What is the probability that the student answers the question correctly?
2. A student answers a multiple-choice question either by knowing the answer or by guessing. The probability that the student knows the answer is 40%. If the student guesses, he has 5 possi- ble choices in the multiple-choice question. What is the probability that the student answers the question correctly?
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Transcribed Image Text:2. A student answers a multiple-choice question either by knowing the answer or by guessing. The
probability that the student knows the answer is 40%. If the student guesses, he has 5 possi-
ble choices in the multiple-choice question. What is the probability that the student answers the
question correctly?
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