Probabilities Lesson

Probabilities Notes

5/3-5/6

Probabilities

• Probability of an event = (# of ways it can happen) / (total number of outcomes)

  
  

  
  

• The probability of an event can only be between 0 and 1 and can also be written as a percentage.

Key Facts

• Mutually Exclusive: A statistical term describing two or more events that cannot happen simultaneously

• Independent Event:  Those events whose occurrence is not dependent on any other event

Essential Question

• How does describing events as mutually exclusive or independent affect how you find probabilities?

Mutually Exclusive

• Name 1 mutually exclusive event.

Vocab

• Favorable Outcome: is an outcome that is being tested or observed and not necessarily a desirable result. A “favorable” outcome may be a loss for the home team or testing positive for a disease.

• Complement of an event: is the set of all

  outcomes in a sample space that are not

  included in the event.

  
  

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