Every 200 years.
Texas averages 135 tornadoes each year.
The chance that a given event will occur, usually expressed between the number 0 (will not occur) and 1 (will occur) is called probability.
The laws of probability predict what is likely to occur, not necessarily what will occur.
The probability that an event will occur plus the probability that it will not occur equals 1.
The chance that a given event will occur usually expressed between the number 0 will not and 1 the event will occur
Every 200 years
Yellowstone was designated a national park in 1872. A BIcentennial does not occur until the 200th anniversary of an event. Thus, the Yellowstone bicentennial will not occur until 2072.
look up the definition of bicentennial
Every 200 years.
A bicentennial is the 200th anniversary of anything. For example, the American Bicentennial was 1976, the bicentennial of Abraham Lincoln's birth is 2009.
A bicentennial day is the 200th anniversary of a significant event (often the founding of a city), so the one specified celebrates something that happened on April 30, 1812.
Bicentennial or bicentennially
Bicentennial means "200th anniversary".
Bicentennial
Bicentennial means 200 years old. We celebrated our country's bicentennial last year.
A bicentennial celebrates 200 years of something.
Bicentennial Tower was created in 1996.