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Expected value and standard deviation

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Reference no: EM131229618

A candidate for public office is thought to have the support of 60% of the voters. A random sample of 100 voters was gathered to verify this position. Use the normal approximation of a binomial to answer the following questions. What are the expected value (mean) and standard deviation for the number of "pro" voters?

  • What is the probability that the number of voters who support the candidate is exactly 50?
  • What is the probability that the number of "pro" voters  is more than 70?
  •  What is the probability that the number of "pro" voters is between 50 and 65?

Reference no: EM131229618

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