Assume that adults have IQ scores that are normally distributed with a mean of 101.1 and a standard deviation 17.8. 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=
In good detail plz
(Type an integer or decimal rounded to one decimal place as needed.)
Given that, mean = 101.1
standard deviation = 17.8
We want to find, the value of x such that, P(X < x) = 0.25
Therefore, the first quartile = 89.2
Note: if we used z-score = -0.67449 then
first quartile = 89.1
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