Final answer:
False, an event happens every biennium means it occurs once every two years, not twice a year. The terms related to events (A, B, T) involve outcomes of two, even numbers, and numbers less than four. The Earth's magnetic field reversal is a rare event occurring approximately every 200,000 years.
Step-by-step explanation:
The statement that an event occurs twice a year when it happens every biennium is false. The term 'biennium' refers to a two-year period, not a semi-annual event. Therefore, an event that occurs every biennium actually takes place once every two years.
Regarding the information provided:
- Event T = the outcome is two.
- Event A = the outcome is an even number.
- Event B = the outcome is less than four.
- The complement of A would be any outcome that is not an even number.
- A GIVEN B is the probability of getting an even number given that we know it is less than four.
- B GIVEN A is the probability of getting a number less than four given that it is even.
As for the magnetic field fact, the Earth's magnetic field flipping direction is a fascinating and fairly rare geological event that takes place approximately every 200,000 years.