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Suppose the length of an oarfish is normally distributed with a mean of 6.5 m and a standard deviation of 1.5 m.

Which group describes 16% of the oarfish population?

Select each correct answer.


  • oarfish that are longer than 8 m
  • oarfish that are between 6.5 m and 9.5 m
  • oarfish that are between 3.5 m and 9.5 m
  • oarfish that are shorter than 5 m
 Feb 15, 2018

Here is a graph of a standard bell curve:  (ya just have to memorize the divisions)

6.5 m would be at the peak

Each line represents an oarfish 1.5 m shorter

The 16% total line is over to the left.....One line from the mean   6.5 - 1 line = 6.5-1.5 = 5 m

....so 16% are shorter than 5m

 Feb 15, 2018

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