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The number of column inches of classified advertisements appearing on Mondays in a certain daily newspaper...

The number of column inches of classified advertisements appearing on Mondays in a certain daily newspaper has mean 320 inches and standard deviation 30 inches. Suppose that the results for 100 consecutive Mondays can be regarded as a random sample and let ¯xx¯ denote the mean number of column inches of classified advertisements in the sample. Assuming a sample of 100 is sufficiently large, the random variable ¯xx¯ has

  • a sampling distribution that is approximately Normal by the central limit theorem.
  • a sampling distribution that has a standard deviation of 3 inches.
  • a sampling distribution that has a mean of 320 inches.
  • All of the above.
math   Statistics-And-Probability   
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Answer: option-D: All of the above Mean - un - 320 13.2 10o Normal distribution Sd; olon - 3000 3 Thank you

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