Consider the previous IQ Scores example, where
X~N(100, 256)
.
Let's Do It! 6.2 - IQ Scores
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What proportion of the 12-year-olds have IQ scores below 84?
What proportion of the 12-year-olds have IQ scores 84 or more?
What proportion of the 12-year-olds have IQ scores between 84 and 116?