OpenStax, Statistics §6.2 Using the Normal Distribution · Try It 5 · Statistics · Normal distribution
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 percent of the exam scores are between what two values?
OpenStax, Statistics · §6.2 Using the Normal Distribution · Try It 5
Stuck? A gentle nudge
No hints for this one.
Your working
Check your full solution
Upload photos of your handwritten work or a PDF, and Lemma will read it and tell you whether it's right — and where it first goes wrong if not.