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15 December, 10:49

A number is randomly selected from {80, 81, 82, 83, 84, 85, 86}.

A is represented by the event that the number picked is less than 84.

What is the probability of the complement of event A?

A. 27

B. 37

C. 47

D. 57

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Answers (1)
  1. 15 December, 11:10
    0
    The probability that the number picked is less than 84 p (A) is:

    number of possible events with picked number less than 84 / total number of possible events = 4/7

    The complement event of A is that event A does not occur. If the picked number is not less than 84 (this means is greater than 84 or is 84). The probability of the complement event is:1 - p (A) = 3/7

    Solution: B
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