What percentage of people has an IQ score between 86 and 114​? ​(b) What percentage of people has an IQ score less than 58 or greater than 142​? ​(c) What percentage of people has an IQ score greater than 128​?

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A: It is given that  Mean, μ = 20 Standard deviation, σ = 4 Sample size, n = 64

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