The determining of probability will be easier if we can register the whole sample points which form the sample space. From that list we can determine the number of events and the number of members of the sample space and then we are able to determine the probability of the event.
Example 3:
In the rolling of two balance dice at the same time. Suppose K states the event when the sum of the two dice’s eyes that appear is equal to 8. Determine the probability of event K.
Answer:
The sample space of the rolling of two balance dice is as the following:

the number of members of sample space =36. The number of members of event K=5. The probability of event K→P(K)=5/36.

Exercise Competency Test 3
1. In a rolling of two balance dice, K states the event when the emerging of the sum of the dice’s eyes is equal to 6. The probability of event K=…

A. 8/36 B. 7/36 C. 6/36 D. 5/36 E. 4/36
Answer: C, Explanation:

2. In a rolling of two balance dice, K states the event when the emerging of the multiplication of the dice’s eyes = 6. The probability of event K=…
A. 1/18 B. ⅙ C. ¼ D. 1/9 E. 5/36
Answer: D, Explanation:

3. There are 30 college students of management and 70 college students of accountancy make studying group. The college students only repeat one subject from the three subjects: English, statistics, or mathematics. There are 30 students only repeat statistics and 50 students only repeat English. There are 40 students of accountancy only repeat English. There are 15 students who repeat mathematics is the students of management. If a student is chosen randomly, then the probability of the chosen student is from accountancy and repeats statistics is ….
A. 0,10 B. 0,20 C. 0,25 D. 0,30 E. 0,45
Answer: , Explanation: