A multiple choice question has 5 available options, only 1 of which is correct. Students are allowed 2 attempts at the answer. A student who does not know the answer decides to guess at random, as follows:
On the first attempt, he guesses at random among the 5 options. If his guess is right, he stops. If his guess is wrong, then on the second attempt he guesses at random from among the 4 remaining options.
a)Find the chance that the student gets the right answer at his first attempt. Solution: 0.2
b)Find the chance that the student has to make two attempts and gets the right answer the second time. Solution 0.2
c)Find the chance that the student gets the right answer. I can΄T understand what this question asking me. Solution 0.2 is wrong!