Using the Normal Distribution · Try It 5
Two thousand students took an exam. The scores on the exam have an approximate normal distribution with a mean μ = 81 points and standard deviation σ = 15 points.
(a) Calculate the first- and third-quartile scores for this exam.
(b) The middle 50% of the exam scores are between what two values?
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Introductory Statistics 2e · §6.2 Using the Normal Distribution · Try It 5
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