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The scores of students on the ACT college entrance examination in a 2009 had the normal...

  1. The scores of students on the ACT college entrance examination in a 2009 had the normal distribution with μ = 21.1 and σ = 5.1.
    1. What is the probability that a randomly chosen student scored 27 or higher on the ACT? (2 points)

    2. What are the mean and standard deviation of the average ACT score x-bar for a SRS of 30 students?(4 points)


  1. What is the probability that the average ACT score of an SRS of 16 students is 27 or higher? (1 points)


Math   Statistics-And-Probability   
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