Page 59 - SPARK OF MATH book 6

(5-2) Probability.

An event is a subset of the sample space.

For example:

Tossing a coin and it landing on heads.

Rolling a number > 4 on a dice.

Tossing two coins and landing numbers of tails.

Probability is the chance that an event will take place.

For example: if you toss a coin, there is a 50 percent

chance each that it might be heads (H) or tails (T).

The chances of any event can be shown on a
probablity scale from 0 to 1:

A probability of 0 tells us that an event will never happen.
It's impossible (example: rolling a "7" on a dice).
A probability of 1 tells us that the event is certain to happen.

(example: rolling a number less than "7" on a dice).

0 1

Impossible Certain

To find out probability, use the following equation:

number of successful
Theoretical probability= P(E)
number of sample space

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