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An American Society of investors survey found 30% of individual investors have used a discount broker....

An American Society of investors survey found 30% of individual investors have used a discount broker. In a random sample of nine individuals, what is the probability that:   

  1. At least one of them used a discount broker;
  2. Find the expected value of the number of the individuals that have used a discount broker;
  3. Find the variance and the standard deviation of the individuals that have used a discount broker.

Math   Statistics-And-Probability   
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