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LMarieee
 3 years 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?
LMarieee
 3 years 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?

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best.shakir
 3 years ago
Best ResponseYou've already chosen the best response.0http://answers.yahoo.com/question/index?qid=20090509090635AAcZ2iP

best.shakir
 3 years ago
Best ResponseYou've already chosen the best response.0mean = 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

LMarieee
 3 years ago
Best ResponseYou've already chosen the best response.0That was wrong, thank you tho.
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