Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard deviation 21.5. Find the first quartile Q₁, which is the IQ score separating the bottom 25% from the top 75%. (Hint: Draw a graph.) The first quartile is (Type an integer or decimal rounded to one decimal place as needed.)

Q: test statistic

A:

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A: n1=100p1^= 0.25n2=300p2^= 0.12

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A:

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Q: variance

A:

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Q: for a sampling distribution

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