10.3.notebook
April 27, 2012
1. Find the middle term of (2x ­ 5)8
Theoretical Probability of an Event
Probability
P(E) = number of successes
total possible outcomes
Def: Measure of the likelihood that an even will occur.
1. You roll a standard six sided die.
Find the prob of rolling a 4.
0 ≤ P(Event) ≤ 1
will not
occur
certain to
occur
Find the prob of rolling a prime number.
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10.3.notebook
April 27, 2012
Using Combinations or Permutations
3. 7 musicians are scheduled to perform,
with different last names.
2. There are 14 seniors, 10 juniors, and 6 freshmen in a PE class. What is the prob of randomly selecting a junior?
a) What is the prob that the musicians perform
in alpha order by their last names?
b) Two of the musicians are female. Find the prob that the first 2 performers are female.
Complement of an event....Prob of the event not happening....P(E)
Find the prob of not selecting a junior.
Geometric Probability...found by calculating a ratio of two lengths, areas,or volumes.
Experimental Probability (Empirical)
Determined by collecting data from an
experiment
5. Given the dart board below, the radii of the
circles are in the ratio 1:2:3. Find the prob of hitting the inner circle.
4. The probability of flipping a coin and getting heads
is 1/2.
Flip a coin 20 times and find the prob of getting
heads based on your experiment.
24 inches
24 inches
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10.3.notebook
April 27, 2012
Conditional Probability...find the prob of an event
given that an another event must occur.
6. Find the prob of selecting a point inside
the triangle formed by y=x, y=3 and y­axis.
7. Find the prob of selecting a queen given that
it is a heart.
8. There are 200 students registered at college.
120 Females (80 PT, 40 FT) and 80 Males (60 PT,
20 FT). Find the prob of selecting a female
student given FT. Find the prob of selecting a FT student given female.
Journal: How do you find the simple probability
of an event?
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