Probability from 0 to 1 - PowerPoint PPT Presentation

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Probability from 0 to 1

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You can show probability as a fraction, decimal or percentage ... Since probability is a fraction, it can never be greater than 1 or less than 0. Random ... – PowerPoint PPT presentation

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Title: Probability from 0 to 1


1
Probability from 0 to 1
  • 0 Impossible
  • 1 Certain

2
Mathematical Probability
  • Probability is a proportion
  • P favorable outcomes / total outcomes
  • You can show probability as a fraction, decimal
    or percentage
  • P (2,4) d6 2 favorable/ 6 total 1/3 , 0.33, 33
  • P (king) standard deck 4kings/52 cards 1/13,
    7.7
  • Since probability is a fraction, it can never be
    greater than 1 or less than 0

3
Random
  • To choose something (a number, a color, a name
    from a hat) blindly is to make a random choice.
  • When you choose something randomly, no matter the
    probability, all outcomes are equally likely
  • In a bag of MMs, if you take one without
    looking, no matter how many of each color is
    there, any one color is as likely as another.

4
Probability Scale
  • Probability can be ranked along a scale from
    0 impossible, to 1 Certain

0 25 ½ 0.75
1 Impossible unlikely even likely
certain
5
Problem
  • A deliveryman sends one newspaper to each of 1000
    houses.
  • Thai Rat 100
  • Manager Daily 250
  • Thailand Daily 170
  • Khom Chad Luek 130
  • Matichon Daily 200
  • Post Today 150
  • If you choose randomly, what is the probability
    of a house having
  • P (Matichon) P (Thai Rat or Post today), P (not
    Manager, or Thailand)
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