Solve IQ Test Problem: Percent Adults Qualifying for MENSA Membership

[alandry06]

The problem goes as such;

The scale of scores on an IQ test is approximately Normal with mean 100 and standard deviation 15. The organization MENSA, which calls itself "the high-IQ society," requires an IQ score of 130 or higher for membership. What percent of adults would qualify for membership?


I know I can use the 68-95-99.7 rule, but I am confused at where to begin.

 

[alandry06]

Wrong section, sorry.

 

[EnumaElish]

The problem goes as such;

The scale of scores on an IQ test is approximately Normal with mean 100 and standard deviation 15. The organization MENSA, which calls itself "the high-IQ society," requires an IQ score of 130 or higher for membership. What percent of adults would qualify for membership?


I know I can use the 68-95-99.7 rule, but I am confused at where to begin.

Can you state the the 68-95-99.7 rule?

 

[Lateral]

You have to standardize first, using Z=X-\mu/\sigma

 

[EnumaElish]

You have to standardize first, using Z =

(X-\mu)/\sigma is what you must have meant.