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Homework Help: AP

Posted by on Wednesday, February 2, 2011 at 11:06pm.

The composite scores of students on the ACT college entrance examination in a recent year had a Normal distribution with mean ยต = 20.4 and standard deviation = 5.8.
1) What is the probability that a randomly chosen student scored 24 or higher on the ACT?

2) What are the mean and standard deviation of the average ACT score for an SRS of 30 students?

3) What is the probability that the average ACT score of an SRS of 30 students is 24 or higher?

4) Would your answers to 1, 2, or 3 be affected if the distribution of ACT scores in the population were distinctly non-Normal? Explain.

  • What?? - , Thursday, February 3, 2011 at 4:25am

    Please type your subject in the School Subject box. Any other words, including obscure abbreviations, are likely to delay responses from a teacher who knows that subject well.

  • AP - , Thursday, February 3, 2011 at 8:14pm

    The subject is Statistics

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