back to probability
# Event

- Event Example 1
- When you throw an unbiased dice with one of the number 1 - 6 on each side, read the number on top and answer the fallowing questions.
- Question (1). Which numbers are probably on top?
- Question (2). Is the number on top will be 0?
- Question (3). Is the number on top less than 7?
- Question (4). Is the number on top will be 5?

- Solution
- You could repeat do this experimentation many times and find,
- Answers (1). Each trial the number on top may not the same. It is possible that one of the number 1 - 6 will be on top on each trial. All possible outcomes is 6 times, but we can not predict which number will be on top before each trial.
- Answers (2). The number on top is absolutely not 0.
- Answers (3). The number on top is certain less than 7.
- Answers (4). The number on top may be 5, but may not be 5, which can not predicted.

- Impossible Event
- The event will never occur. Question (2) is an impossible event.

- Certain Event
- The event must happen. Question (3) is a certain event.

- Random Event
- The event may or may not occur, which can not predicted. Question (4) is a random event.

- Event Example 2
- In the following event, indicates which one is impossible event? which one is certain event? which one is a random event?
- (A). Throw a fair coin once, its head is up.
- (B). Water will freeze at zero degree C.
- (C). Water in Atlantic Ocean will dry up next year.
- (D). There is always champion in tennis tournament.

- Answer Event Example 2
- (C) is an impossible event since water in Atlantic Ocean is always there.
- (B) and (D) are certain event since (B) and (D) are true statements.
- (A) is a random event since throw a fair coin once, its head may up, or its tail may up, which can not predicted.

- Event Example 3
- here are one goldfish and 99 blackfishes with the same size in a pond. Bob and John go to fishing in the pond. If John get one fish, which one of the following statements is true?
- (A). It is not a goldfish.
- (B). It is certain a blackfish.
- (C). It is may be a goldfish.
- (D). It is may be a redfish.

- Answer Event Example 3
- (C) is true
- (A) is not true because there is a goldfish in the pond, John may get it.
- (B) is not true. Through there are 99 blackfish but John may get a goldfish.
- (C) is true since there is one goldfish in the pool and john may get it.
- (D) is not true because there is not a redfish in the pool.