WARM UP mini Quiz

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WARM UPmini Quiz
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• The union of sets A and B contain all of the
  elements in A and in B
• The intersection of sets A and B contain the
  elements in both A and in B

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• A 2,3,4 B3,4,5
• Find
• 2,3,4,5
• Find
• 3,4

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• If sets A and B have not elements in common they
  are disjoint or mutually exclusive
• EXAMPLE of mutally exclusive sets
• A 2,3,4 B7,8,9

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• If A and B are mutually exclusive events then

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• EXAMPLE
• If two fair dice are tossed, what is the
  probability of a sum of 7 or 11?
• Find the P(7)
• Find the P(11)
• P(7 or 11) P(7) P(11)

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• 350 people attend a two day conference
• 231 attend on Friday and 252 people attend on
  Saturday
• Find the number of people that attended both days

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• If A and B are any events in the same finite
  sample space then

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• If a pair of dice is thrown. What is the
  probability that the dice show doubles or a sum
  over 7?
• Find the P(doubles)
• Find the P(sum over 7)
• Find the P(both)

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• EXAMPLE 3
• Two fair dice are rolled
• Find P(sum of dice 7)
• Find P(sum of dice 1)
• Find P(sum of dice lt10)
• Find P(sum of dice lt50)

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• Complementary Events
• If events are mutually exclusive and their union
  is the entire sample space the events are
  complementary.
• The complement of A is called not A.

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• EXAMPLE
• Two dice are tossed. Find the probability of
  each event.
• Their sum is seven.
• Their sum is not seven.

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HOMEWORK

• Read section 7-2
• Page 4371-11, 16,18,19