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Response to left on green only (Reply #3)

Mon Nov 5, 2012, 04:48 AM

23. It's actually very easy to figure out

IQ is a normal distribution curve with mean 100 and Standard deviation of 16.

z=(x-mean)/sd

z(95) = (95-100)/sd =-.3125
z(105) - (105-100)sd=.3125

p(IQ between 95 and 105) = p(x<105) - p(x<95)

from z table
P(x<105)=.6217
p(x<95)=.3783

.6217-.3783=.2434 apx 24% of people have an IQ between 95 and 105

That's not most, but a good portion of people.

50% of all people have an IQ that is between + or - .67 standard deviations from the mean that puts Interquartile range of IQ between 89 and 111

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