The graph above shows a standard normal distribution with the area between $Z = -1.75$ and $Z = 1.75$ shaded in light blue. This shaded region represents the probability that a randomly selected person's IQ lies between 72 and 128, which is approximately 91.98%.

Would you like further details or explanations? Here are five additional questions related to this topic:

1. How do you calculate probabilities for values outside the standard deviation range?
2. What is the probability of having an IQ above 128?
3. How can Z-scores be used to compare different datasets?
4. How do you interpret Z-scores in different contexts?
5. Can the IQ distribution change over time or in different populations?

Tip: Z-scores help standardize data, allowing comparisons between different distributions.