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Question 767:

IQ scores are normally distributed with a mean of 100 and a std dev of 15. If 25 people are randomly selected for an IQ test, find the probably that their mean score is between 95 and 105.

If you need help with the concepts covered in this question (like z-scores and the normal-curve) you can download a visual and easy to understand Crash Course in Z-scores and an Excel Calculator which will do everything you need to do with z-scores.

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