1. Ch.9.1_PercentsAndProbabilities.notebook March 13, 2012
Theoretical Probability of an event (E)
P(E) = # of desired outcomes
total # of outcomes
Coin Flip Rolling 6­sided Dice
P(tails) = P(roll a 4) =
P(roll an odd #) =
Drawing Cards From
a Standard Deck
­52 total cards
­4 suits (clubs, spades,
hearts, and diamonds)
­12 face cards (J, Q, K)
­3 face cards per suit
P(draw a 7) =
P(draw a red card) =
P(draw a club) =
P(draw a black jack) =
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2. Ch.9.1_PercentsAndProbabilities.notebook March 13, 2012
Experimental Probability of an event (E)
There are 30 players on the Dunlap Lacrosse Team. 2 players
are 18 years old, 8 players are 17, 6 players are 16, 7 players
are 15, and 7 players are 14.
What is the probability that a
randomly selected player
is 16 or older?
Derrick Rose has made 1102 of 1349 career free throws.
What is the probability that he misses a free throw?
How many free throws is he expected to make if he has
300 attempts this season?
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3. Ch.9.1_PercentsAndProbabilities.notebook March 13, 2012
Fundamental Counting Principle
Jack has 6 pairs of shoes, 15 pairs of pants/shorts,
and 22 shirts. How many DIFFERENT outfits can he
create?
4 coins are flipped. How many different heads­tails
combinations are possible?
ATM machines use PIN numbers for security. If each
PIN number is 4­digits long and only contains digits 0­9,
how many unique PIN numbers exist?
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4. Ch.9.1_PercentsAndProbabilities.notebook March 13, 2012
Two 6­sided dice are rolled. What is the probability
that the 2 numbers add up to 8?
What is the probability that the
sum is an odd number?
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