Question

Assume that adults have IQ scores that are normally distributed with a mean of 100.5 and a standard deviation 20.5. Find the first quartile Upper Q 1, which is the IQ score separating the bottom 25% from the top 75%. (Hint: Draw a graph.) The first quartile is nothing. (Type an integer or decimal rounded to one decimal place as needed.)

Answer #1

From the Question, Mean = 100.5 and Std. Deviation = 20.5

and we have to find Value

Refering to the Standard Z-Table,

Therefore, Subtituting the Values in the Above Formula:

Value = **86.6625**

Therefore, the Value Separating bottom 25% from Top 25% is
**86.6625**

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