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A variable has mean 30 and standard deviation 6. What are the mean and standard deviation of ?

Competition practiceStatistics
  • AMean 0, SD 6
  • BMean 5, SD 1
  • CMean 1, SD 0
  • DMean 0, SD 1

Step-by-Step Solution

Subtracting 30 moves the mean to 0 and leaves the SD at 6; dividing by 6 makes the SD 1 (and keeps the mean 0). This is the standard score.
Answer: D) Mean 0, SD 1

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