Learning Outcomes:

1-Explain probability as a numerical description of the

likelihood of an event.

2-Assign probabilities based on intuition or experience.

3-Estimate probabilities by performing experiments.

•An impossible event has a 0%

chance. The chance of a

•certain event is 100%.

Chances can be described

numerically on a scale from 0%

to 100%.

Probability is a number between 0 and

1 (inclusive) that

describes the likelihood that an event

will happen. In this section you learned

some ways to assign probabilities—

based on intuition, on history, or on

data from experiments. In the next

sections you will use these ideas to

assign probabilities to some more

complicated events.