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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?
 one year ago
 one year ago
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?
 one year ago
 one year ago

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best.shakirBest ResponseYou've already chosen the best response.0
http://answers.yahoo.com/question/index?qid=20090509090635AAcZ2iP
 one year ago

best.shakirBest ResponseYou've already chosen the best response.0
mean = 100 SD = 15 zvalue = (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
 one year ago

LMarieeeBest ResponseYou've already chosen the best response.0
That was wrong, thank you tho.
 one year ago
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