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Normal distribution if IQ score. Mean of 100 and standard deviation of 15. The exercise question is asking what percentage of scores are less than

Normal distribution if IQ score. Mean of 100 and standard deviation of 15. The exercise question is asking what percentage of scores are less than 70. Do I substract 70 from 100 and divide by 15? They are coming up with a answer of 2.28. Thanks for an explanation.

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