Elementary Statistics - Z-scores that separate the middle - TI-84

In this video, I will explain 2 problems about calculating z-scores.
The first problem is, "Find the Z-scores that separate the middle 12% of the distribution from the area in the tails of the standard normal distribution."
The second problem is, " IQ scores are approximately normal with a mean of 100 and a standard deviation of 15. Identify the IQ scores that separate the middle 80% of people."

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