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If an event has a probability of 1, it will happen no matter what.
The probability of rolling a number x, such that 1 ≤ x ≤ 6, on a standard 6 sided die, is 1.
The probability of the temperature being > absolute 0, is 1.
With a standard 52 card deck of card, P(drawing a spade or drawing a club or drawing a heard or drawing a diamond) is 1.
In these situations, there is no variable that can affect the event. It will happen no matter what.
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What is the probability of exactly 3 girls out of three children?
There is no simple answer to the question because the children's genders are not independent events. They depend on the parents' ages and their genes.However, if you assume that they are independent events then, given that the probability of a girl is approx 0.48, the probability of three out of three being girls is 0.1127.
Is the poisson probability of three events in one hour the same as the probability of 36 events in one day?
No. There are 24 hours in a day, not 12!
Are mutually exclusive events also complementary events?
Not necessarily. The probability of a complementary event with probability p is 1-p. Two mutually exclusive events, however, don't necessarily add up to a probability of 1. For example, the probability of drawing a King from a standard deck of cards is 1 in 13, which the complementary probability of not drawing a King is 12 in 13. The probability, however, of drawing a Heart is 1 in 4, while the probability of drawing a Club is also 1 in 4. That leaves Diamonds and Spades, which account for the remaining probability of 2 in 4.
What is the probability of rolling a 3 or a 4?
2/6 or 1/3 or 0.3333.
Probability of an event occurring to the probability that it won't occur?
These events are complementary. Let P(A) = probability event will occur. Then the probability it will not occur is: 1 - P(A).
