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(Q 3) Suppose that only 30% of students use e-textbooks. Select randomly four students from our class (assuming independence) and find the probability that: (a)

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(Q 3) Suppose that only 30% of students use e-textbooks. Select randomly four students from our class (assuming independence) and find the probability that: (a) None of them use e-textbooks. ANS. (b) At least one of them uses e-textbooks. ANS. (Q 4) Suppose that A and B are two independent events with P(A) = 0.45 and P ( B ) = 0.55. Find P ( A or B ) =

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