IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Using the empirical rule, what percentage
of people have an IQ score between 70 and 130?
1 answer:
70 = 100 - 2•15 is 2 s.d.'s below the mean.
130 = 100 + 2•15 is 2 s.d.'s above the mean.
By the empirical rule,
Pr [70 ≤ X ≤ 130] = Pr [-2 ≤ Z ≤ 2] ≈ 95%
(where Z is normally distributed with mean 0 and s.d. 1)
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Do you want a ratio? If yes, the ratio is 120:52
A tranversal is a line that cuts and divides other lines proportionately
So the equation here is
95*(1+x) = 109.25
solve for x
1+x = (109.25/95)
x = (109.25/95) -1
x = .15 or 15%
Answer:
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Step-by-step explanation:
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