SOLUTION: In a population of adults, normal distribution with mean 112 and standard deviation of 21. whats the percentage of adults with an IQ greater than 154?
Algebra ->
Probability-and-statistics
-> SOLUTION: In a population of adults, normal distribution with mean 112 and standard deviation of 21. whats the percentage of adults with an IQ greater than 154?
Log On
Question 647251: In a population of adults, normal distribution with mean 112 and standard deviation of 21. whats the percentage of adults with an IQ greater than 154? Answer by colliefan(242) (Show Source):
You can put this solution on YOUR website! An IQ score of 154 is two standard deviations above the mean. [112 + 2(21) = 154]
95% of the population is within 2 standard deviations of the mean. That means that 2.5% of the population is lower than 2 standard deviations below the mean and 2.5% is above 2 standard deviations above the mean. Therefore 2.5% have IQ greater than 154 (and 2.5% have IQ below 70 because it is 2 standard deviation below the mean).
(