Probability

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Probability
Jennifer Farist
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Table of Contents

• Definitions
• Important terms
• Uses in real life
• Probability of eye color
• Chances vs. odds
• What are the chances?
• What are the odds?
• How do we get these numbers?
• Websites to learn more

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DefinitionProbability is

• The study of chance
• The likelihood that a given event will occur
• a measure of how likely it is that some event
  will occur

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Important terms

• Likely
• Unlikely
• Chance
• Perhaps
• Outcome

• Probably
• Possible
• Impossible
• Maybe
• Odds

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Uses in real life

• Weather reports
• Medical findings
• Political doings
• State lotteries-
• Funny video

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What color eyes will your children have?

• http//museum.thetech.org/ugenetics/eyeCalc/eyecal
  culator.html

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Chances vs. odds
One way to describe the chance of an events
occurring is by using odds. The odds in favor
of an outcome is the ratio of the number of ways
the outcome can occur to the number of ways the
outcome cannot occur. Finding Odds in favor
number of successes number of failures the Odds
The odds against an outcome is the ratio of the
number of ways the outcome cannot occur to the
number of ways the outcome can occur. Odds
against number of failures number of successes
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Odds of events occurring
Becoming the president of the United States 10,000,0001
Becoming an astronaut 13,200,0001
Winning an olympic gold medal 662,0001
UFO sighting today 3,000,0001
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Explanation of odds

• Becoming the president of the United
  States 10,000,000 1

Ten million people do not become president
For every one person who becomes president
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What are the chances?

• Chance of getting the flu this year 1 in 10
• Chance of dying from a shark attack 1 in
  300,000,000
• Chance of an American home having at least one
  container of ice cream in the freezer 9 in 10.

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Explanation of chances
Chances of randomly choosing a vowel from the
alphabet 5 vowels- a,e,i,o,u 26 letters in
all
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Same information in bar graph
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How do we get these numbers?

• Fractions
• Decimals
• Ratios

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Web sites to explore to learn more

• http//www.webmath.com/lottery.html
• http//nces.ed.gov/nceskids/chances/
• http//www.brainpop.com/math/dataanalysisandprobab
  ility/basicprobability/
• http//pbskids.org/cyberchase/games/probability/in
  dex.html
• http//www.betweenwaters.com/probab/probab.html
• http//mathforum.org/dr.math/faq/faq.prob.world.ht
  ml