flipping a coin
P(head) = 1/2 or 0.5 or 50%
P(tail) = 1/2 or 0.5 or 50%
When you have a list of possible outcomes. e.g. Heads or tails
1. P(head) + P(tail) = 1
2. P(head) = 1 - P(tail)
3. P(tail) = 1 - P(head)
Those were all a formula of an exhaustive event. Always adds up to a 1.
P(A) - Probability of event A happening
P(A') - Probability of event A not happening
P(A') = 1 - P(A)
1.In a pack of maths cards are there any jokers?
2.How many cards are there?
3.Name the 4 suits.
4. How many cards are there in each suit?
5.What number is a ace equal to?
6.What cards are called face cards?
3.Diamonds, hearts, clubs, spades.
6.Jack, queen, king
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