anonymous
  • anonymous
Some psychologists believe that a "genius" should be defined as anyone having an IQ over 140. If IQ scores are? normally distributed with a mean of 100 and a standard deviation of 17, and if the population of the world is 6,575,000,000, how many geniuses are there in the world today?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
http://answers.yahoo.com/question/index?qid=20090509090635AAcZ2iP
anonymous
  • anonymous
mean = 100 SD = 15 z-value = (140 - 100)/15 = 2.67 to 2 DP looking up a z- table, P[IQ >140] = 0.0038 or 0.38% so estimated # of geniuses = 0.38% of 6,575,000,000 = 24,985,000 [C] <=== ANS
anonymous
  • anonymous
That was wrong, thank you tho.

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UnkleRhaukus
  • UnkleRhaukus
UnkleRhaukus
  • UnkleRhaukus
that's 0.93%
UnkleRhaukus
  • UnkleRhaukus
61,147,500

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