Question 18.4

18.4 Probability models. Which of the following is true of any legitimate probability model?

  1. (a) The probabilities of the individual outcomes must be numbers between 0 and 1, and they must sum to no more than 1.

  2. (b) The probabilities of the individual outcomes must be numbers between 0 and 1, and they must sum to at least 1.

  3. (c) The probabilities of the individual outcomes must be numbers between 0 and 1, and they must sum to exactly 1.

  4. (d) Probabilities can be computed using the Normal curve.