On a planet far far away from Earth, IQ of the ruling species is normally distributed...

Question

Question

Answer 1

Answer #1

Solution:

X: IQ of an individual

μ = 118

σ = 18

a)

for bottom 4%

Z = -1.751

x = z*σ + μ

= -1.751*18 + 118

= 86.49

Answer: 86.49

b)

Q1 = 106.86

Q3 = 130.14

IQR = 23.28

Answer 2

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