SOLUTION: IQ scores are normally distributed with a mean u=100 and a standard deviation o=15. Based on this distribution determine. A. the percentage of IQ scores between 100 and 120.

Question 84940: IQ scores are normally distributed with a mean u=100 and a standard deviation o=15.
Based on this distribution determine.
A. the percentage of IQ scores between 100 and 120.

B. the probability of selecting a person at random having an IQ between 100 and 120.

C. the percentage of IQ scores between 88 and 100.

D. the probability of selecting a person at random having an IQ between 88 and 100.

E. the percentage of IQ scores that are 110 or above.

F. the probability of selecting a person at random having and IQ of 110 or above

Answer by Nate(3500) (Show Source): You can put this solution on YOUR website!
You have to break these up to make a bell-curve.
<---- 70 ---- 85 ---- 100 ---- 115 ---- 130 ---->
Plug in the percentages:
<--(2.2%)-- 70 --(13.6%)-- 85 --(34%)-- 100 --(34%)-- 115 --(13.6%)-- 130 --(2.2%)-->
A. the percentage of IQ scores between 100 and 120.
34% > x > 13.6%
B. the probability of selecting a person at random having an IQ between 100 and 120.
34% > x > 13.6%
34/100 > x > 13.6/100 likewise
C. the percentage of IQ scores between 88 and 100.
34%
D. the probability of selecting a person at random having an IQ between 88 and 100.
34% or 34/100 likewise
E. the percentage of IQ scores that are 110 or above.
50% > x > 15.8%

F. the probability of selecting a person at random having and IQ of 110 or above
~ likewise
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