jan is a member of a class with 23 students. each day for a week (monday to friday), a student in jan's class is randomly selected to explain how to solve a homework problem. once a student has been selected, he or she is not selected again that week. if jan was not one of the four students selected earlier in the week, what is the probability that she will be picked on friday? (enter your answer as a fraction.)

Question

27-10-2022
Mathematics

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jan is a member of a class with 23 students. each day for a week (monday to friday), a student in jan's class is randomly selected to explain how to solve a homework problem. once a student has been selected, he or she is not selected again that week. if jan was not one of the four students selected earlier in the week, what is the probability that she will be picked on friday? (enter your answer as a fraction.)

Answer :

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rafikiedu08 rafikiedu08 · Answer 1 · 2022-10-31T14:08:29-04:00

The probability that Jan will be picked on Friday is 1/19.

The number of students in the class is 23. It is given that each day for a week (Monday to Friday), a student in Jan's class is randomly selected to explain how to solve a homework problem. Once a student has been selected, he or she is not selected again that week.

Jan wasn't one of the four students selected earlier this week. So, the number of students left who can be selected are 23-4 = 19.

The probability that Jan will be picked on Friday is one divided by the number of students left whose turn hasn't come yet.

P = 1/19

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