Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a standard deviation of 14. Use the empirical rule to determine the following. (a) What percentage of people has an IQ score between 72 and 128 ? (b) What percentage of people has an IQ score less than 86 or greater than 114 ? (c) What percentage of people has an IQ score greater than 128 ?
Added by Jeffrey H.
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7 rule) for a normal distribution: - Approximately 68% of the data falls within 1 standard deviation (σ) of the mean (μ). - Approximately 95% of the data falls within 2 standard deviations (σ) of the mean (μ). - Approximately 99.7% of the data falls within 3 Show more…
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