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1. In any normal distribution, the boundary that separates the bottom 34% from the rest of the distribution is located at z = ________. 2.

1. In any normal distribution, the boundary that separates the bottom 34% from the rest of the distribution is located at z = ________.

2. Intelligence (IQ) scores form a normal distribution with M = 100 and SD = 15. What z-score would a person need to be in the top 10%?

3. Research indicates that the average adult sleeps M = 360 min a night with SD = 90 min, which forms a normal distribution. What is the probability of randomly selecting an adult who sleeps between 360 min and 500min a night?

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