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# Probability

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```									     Probability

By: JJ, Sinjon, and Austin
Intro to Probability
• What is probability

Definitions
Probability- is a fraction of favorable
outcomes over the total of possible
outcomes

How to find probability
Basic Probability
Probability of independent events
Probability of compound events
Examples
• There are 12 boys in the class, and 8
girls in the class.
• Each student has there name in a
hat.
• What is the probability of drawing a
girl?
• First find the total of all the names
12+8= 20
• Next find how many girls are in the
class= 8
• So 8/20 is the answer or 4/5
Practice
• Ekul is exploring the African
wilderness. In the brush around him
there is a harmless green snake, a
dangerous rattlesnake, and 2
extremely venomous king snakes.
What is the probability that Ekul will
be attacked by a one of the
dangerous snakes.

Practice
• Xander is a professional skydiver. He
is grabbing his parachute when the
pilot approaches him and says “One
parachute is dysfunctional, another
has a ripped parachute, and one has
a faulty rip cord.” There is a total of
5 parachutes. What is the probability
that Xander will pick a working
parachute?

Practice
• Borscehkoff the Viking is deciding which
village to pillage. He has been warned that
2 of the coastal villages have have a highly
trained citizen defense service. He has
also learned that 3 other coastal villages
have been diagnosed with an extremely
dangerous epidemic. He must choose from
a total of 9 villages. What is the
probability that Borscehkoff will pick a
safe town to plunder?

Practice Game
Turn to Page 567 in a Real Math book

Get one red die numbered 0-5
Get one blue die numbered 5-10

Take 2,3,or 4 rolls to get closest to 15

Play in groups of 2
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