Probability

Probability

1. Many events can't be predicted certainly, the best we can say is how likely they are to happen, using the idea of probability.

2. Tossing a coin

   • When a coin is tossed, there are two possible outcomes:
     • Heads (H)
     • Tails (T)
     • We say that the probability of the coin landing H is ½. And the probability of the coin landing T is ½.

3. Throwing a dice

   • When a single die is thrown, there are six possible outcomes: 1, 2, 3, 4, 5, 6.
     • The probability of any one of them is 1/6.

4. Probability line

5. Probability is just a guide

   • Example: toss a coin 100 times, how many Heads will come up?
     • Probability says that heads have a ½ chance, so we would expect 50 Heads. But when you actually try it out you might get 48 heads, or 55 heads , but in most cases it will be a number near 50.

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