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For example, The probability of a tossed fair coin coming up heads is ½ = 0.5 = 50% because there is one favourable outcome (heads) out of 2 possible outcomes (heads and tails).

For example, The probability of a tossed fair coin coming up heads is ½ = 0.5 = 50% because there is one favourable outcome (heads) out of 2 possible outcomes (heads and tails).

With a standard deck of 52 playing cards, there are 13 cards in each suit: spades, hearts, clubs and diamonds. After you shuffle the cards thoroughly, what is the probability that the top card on the deck is a heart? 13 / 52 = 1 / 4 = 0.25 or 25 percent.

With a standard deck of 52 playing cards, there are 13 cards in each suit: spades, hearts, clubs and diamonds. After the deck is shuffled thoroughly, the probability that the top card on the deck is a heart is  <math>13 / 52 = 1 / 4 = 0.25</math>, or 25%.