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I could use some help with this problem?

  1. Apr 12, 2008 #1
    I could use some help with this problem?
    In a certain state 60% of the voters are democrats. Randomly select a sample of 300 voters.

    A. Describe the sampling distribution of the sample proportion.

    B. what is the smallest required size of sample for the distribution of the sample proportion to be approximately normal?

    C. what is the probability that 190 or less voters are democrats?

    D. what is the probability that 150 or more voters are democrats?

    E. What is the probability that the number of democrats is between 140 and 230?
  2. jcsd
  3. Apr 12, 2008 #2


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    Staff Emeritus
    Science Advisor

    Same as for your other post: homework questions, no attempt to solve them yourself.
  4. Apr 12, 2008 #3
    show some attempt.
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