Ask Question
7 January, 16:04

A pair of fair dice is rolled. Let E denote the event that the number falling uppermost on the first die is 2, and let F denote the event that the sum of the numbers falling uppermost is 8. (Round your answers to three decimal places.)

(a) Compute P (F).

(b) Compute P (E ∩ F).

(c) Compute P (F | E).

(d) Compute P (E).

+1
Answers (1)
  1. 7 January, 16:16
    0
    First of all, note that there are 36 possible outcomes (all the numbers from 1 to 6 from the first die, combined with all the numbers from 1 to 6 from the second die).

    a. Out of these 36 outcomes, the only ways to get 8 as sum are: (2, 6), (3, 5), (4, 4), (5, 3), (6, 2). There are 5 favourable cases over 36 possible cases, so the probability is 5/36.

    b. We want to get 8 as sum, and the first die must be a 2. Out of the five pairs we got before, only the first satisfies this request, so the probability is 1/36

    c. Knowing that the first die was a 2, we have 6 possible outcomes:

    The second die rolls a 1, for a total of 3.

    The second die rolls a 2, for a total of 4.

    The second die rolls a 3, for a total of 5.

    The second die rolls a 4, for a total of 6.

    The second die rolls a 5, for a total of 7.

    The second die rolls a 6, for a total of 8.

    So, there is 1 favourable outcome out of 6 possible outcomes, so the probability is 1/6

    d. The die is fair, so every number occurs with probability 1/6.
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “A pair of fair dice is rolled. Let E denote the event that the number falling uppermost on the first die is 2, and let F denote the event ...” in 📗 Mathematics if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers