A bag contains 5 black, 4 white and x red marbles. If the probability of picking a red marble is 2/5, find the value of x
The probability of picking a letter T from the word OBSTRUCTION is?
The result of rolling a fair die 150 times is as summarized in the table above. What is the probability of obtaining a 5?
The probability of a student passing any examination is 2/3. If the students takes three examination, what is the probability that he will not pass any of them?
| Marks | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| No. of students | 3 | 4 | 1 | 0 | 4 | 5 | 2 | 1 |
The table above shows the distribution of marks of students in a test. Find the probability of passing the test if the pass mark is 5?
| 3 |
| 5 |
| 2 |
| 5 |
| 7 |
| 20 |
| 1 |
| 5 |
