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A sequence of seven people walk into a post office and only their sexes are noted (in sequence) as they enter.
a. How many outcomes are in the sample space?
b. Let A2 be the event that exactly two of the people are females. How many outcomes are in A2?
c. Let Aj be the event that exactly j of the people are females. How many outcomes are in Aj?
d. If each of the seven customers is equally likely to be male or female, what probability should be associated with event Aj? |
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