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In statistical terms, an event with a probability of 1 in 300,000,000 is considered rare. This means that out of a population of 300 million, only one individual is expected to experience this event. The rarity of an event is often determined by comparing its probability to the total population or sample size. In this case, the likelihood of the event occurring is extremely low, making it rare.
It is doing a trial again and again and recoding the outcomes. For example tossing a coin and recording whether the coin came up heads or tails, or driving along a road to a specific set of traffic lights and recoding whether the lights were red or green (or amber)..
in the USA, most commonly, K as in 10,000 can be abbreviated 10K (an often used abbreviation when discussing a running event) the financial press by the way often uses M and B for million and billion
a future event
If the probability of an event is zero then that event cannot happen