Probability
Independent and Dependent Events
What is probability?
How do you find the probability
of two events happening?
Probabilities based on the outcomes
obtained by conducting an experiment
are called experimental probabilities.
Probabilities based on known
characteristics or facts are called
theoretical probabilities. Theoretical
probability tells you what should happen
in an experiment.
The table that shows the results of tossing
three coins, one at a time, 50 times.
What is the theoretical probability of
tossing exactly two heads?
Find the experimental probability of tossing exactly
two heads.
How likely is it that a toss will have two heads? Explain.
There are 4 red, 8 yellow, and 6 blue socks mixed up
in a drawer. Once a sock is selected, it is not
replaced. Find the probability of reaching into the
drawer without looking and choosing 2 blue socks
P(two blue socks) =
P(red sock then a yellow sock) =
P(blue sock, a red sock and then a yellow sock) =
A card is drawn from the cards shown and not
replaced. Then, a second card is drawn. Find each
probability.
P(two even numbers) =
P(a number less than 4 and then a number greater than 4) =