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Probability of a frequency

  1. Jul 18, 2010 #1
    Let's say I survey 20 people out of a 35-person population. 16 people answered yes to a particular question. What is the probability that only 16 people out of the total population would answer yes?

    Attempt at a solution: The number of those not surveyed have an equal
    probability of answering yes or no. Thus the probability of
    those not surveyed all answering no is .003%.
     
  2. jcsd
  3. Jul 19, 2010 #2

    CompuChip

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    How did you get 0.003%?

    What is the probability that any given individual will answer 'yes'?
    How many people are remaining?
     
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