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I 'm working on a homework exercise. The question is, sketch the normal distribution of IQ score. Which has a mean of 100 and a standard deviation of...

I 'm working on a homework exercise. The question is, sketch the normal distribution of IQ score. Which has a mean of 100 and a standard deviation of 15. It says to give the percentage of scores less than 115. My question is, do I substract 115 from 100 and divide by 15 ? Thanks for your help with this question. The answer they are coming up with is 2.28.

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