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anonymous
 5 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?
anonymous
 5 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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amistre64
 5 years ago
Best ResponseYou've already chosen the best response.1the bell curve is divided iinto whay ; 96% at the right ?

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.1i got an a intyping....honest lol

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.1http://www.easycalculation.com/statistics/standarddeviation.php might be useful

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.1thats the reverse of what you wanted .... gotta learn to read :)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0lol so this wont help me ? thanks anyway:)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0We make the curve standard normal. \[(X\mu)/(\sigma)\] (140100)/17 that's a z score of 2.353. The probability of being that or higher can be looked up in a standard normal table. It is a probability of about .0094. Multiply this by the population of 6.575E9 to get the number of geniuses. I get 61,805,000 geniuses.
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