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Probability-Spinners _ Coins

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					  Probability –
Spinners & Coins
   M/J Math 1
EETT Lesson #7
•Outcomes are the possible
 results of a probability event.
•Probability is the chance that
 something will happen.
•P(event) =
        ways event can happen
       total possible outcomes
•Marble Example: In one marble
 is chosen, then find…
             5
•P(blue)   = 12
              4   1
•P(green) = 12 = 3
          3     1
•P(red) = 12 = 4
              0
•P(yellow) = 12 = 0
 •Always reduce!
•The probability of an event
 occurring is always from 0 & 1.

    0             ½           1
Impossible     Equally     Certain
                Likely
•Sample space is the set
 of all possible outcomes.
 •Ex: Flipping a coin = {H or T}
•Coin & number cube: If
 your flip a coin and roll a
 six-sided number cube,
 then find…
            1
 •P(H, 3) =
             12
                     3    1
•P(T, Odd #) =       12
                        = 4
                              6    1
•P(H or T, Prime #) =         12
                                 = 2
             0
•P(T, 7) =   12
                =0
•Spinner example: If both
 spinners are
 spun once, find…        4       2
                    3
•P(sum of 7)      = 16       6   8
             1
•P(2, 1)   = 16
                  0          3   5
•P(sum <     2) = 16 = 0
                    6    1   1   7
•P(sum >     10) = 12 = 2

				
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