Statistics question

1. Sep 27, 2007

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.

2. Sep 27, 2007

alandry06

Wrong section, sorry.

3. Sep 27, 2007

EnumaElish

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

4. Sep 28, 2007

Lateral

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

5. Sep 28, 2007

EnumaElish

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

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