Homework Answers
(4)
(a) z = (x - μ)/σ = (82 - 85)/6 = -0.5 for the first exam
z = (x - μ)/σ = (56 - 60)/5 = -0.8 for the second exam
Since -0.5 > -0.8, the grad on exam 1 has a better relative position
(5)
μ = 650, σ = 153.5, x = 800
z = (x - μ)/σ = (800 - 650)/153.5 = 0.9772
P(x > 800) = P(z > 0.9772) = 0.1642
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