Probability Concepts Quiz

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Questions and Answers

What does the multiplication theorem of probability state?

  • The intersection of two events is equal to the sum of their individual probabilities.
  • The probability of two dependent events is equal to the sum of their individual probabilities.
  • The probability of two independent events is equal to the product of their individual probabilities. (correct)
  • The probability of two mutually exclusive events is equal to the product of their individual probabilities.

How is conditional probability defined?

  • The probability of event A occurring after event B has occurred.
  • The probability of event A and B occurring simultaneously.
  • The probability of event B occurring after event A has occurred. (correct)
  • The probability of event A and event B being mutually exclusive.

In the scenario with tickets numbered 1 to 30, what is the probability of selecting a ticket that is neither a multiple of five nor three?

  • $\frac{3}{5}$
  • $\frac{5}{6}$
  • $\frac{4}{5}$
  • $\frac{2}{3}$ (correct)

In a city where 20% read newspaper A, 16% read newspaper B, and 14% read newspaper C, what is the probability of reading at least one newspaper?

<p>35% (B)</p> Signup and view all the answers

If events A and B are independent, what can be said about the probability of their intersection?

<p>It must be zero. (D)</p> Signup and view all the answers

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Study Notes

  • Conditional probability is defined as the probability of event B occurring after event A has occurred, denoted as P(B|A), calculated as the probability of the intersection of B and A divided by the probability of A.
  • The multiplication theorem of probability states that if events A and B have probabilities greater than 0, the probability of their intersection is equal to the product of their individual probabilities.
  • When calculating the probability of reading at least one newspaper in a city where 20% read A, 16% read B, and 14% read C, along with overlapping readerships, the percentage is found to be 35%.
  • In another scenario where one ticket is randomly selected from tickets numbered 1 to 30, the probability of selecting a ticket that is a multiple of five or three is calculated to be 1/3 and 7/15 respectively.

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