Every 200 years.
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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