student must take an objective exam comprising 25 questions. For each question there is only one answer. correct among the 4 suggested answers. If this student, not having not worked at all, answers questions in a manner completely random: a) How many correct answers can he expect? b) What is the probability that he will pass his exam, that is t
student must take an objective exam comprising 25 questions. For each question there is only one answer. correct among the 4 suggested answers. If this student, not having not worked at all, answers questions in a manner completely random: a) How many correct answers can he expect? b) What is the probability that he will pass his exam, that is t
Chapter8: Sequences, Series,and Probability
Section8.7: Probability
Problem 4ECP: Show that the probability of drawing a club at random from a standard deck of 52 playing cards is...
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Question
A student must take an objective exam comprising 25
questions. For each question there is only one answer.
correct among the 4 suggested answers. If this student, not having
not worked at all, answers questions in a manner
completely random:
a) How many correct answers can he expect?
b) What is the probability that he will pass his exam, that is to say that he will have at least 15 correct answers? (give the
answer with 4 decimal places)
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