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Two numbers have a mean of 15 and a standard deviation of 4 (divisor n). What is their product?

Competition practiceStatistics
  • A225
  • B221
  • C195
  • D209

Step-by-Step Solution

For two numbers the SD is half their difference, so they are : 11 and 19. Product . (225 is )
Answer: D) 209

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