The 68‑95‑99.7 rule tells us how to find the middle 68%, 95%, or 99.7% of a Normal distribution. Suppose we wanted to find numbers A and B, so that the middle 80% of a standard Normal distribution lies between A and B, where A is less than B. Which of the answers below is not true of A and B? A: 10% of the distribution lies above B. B: B is approximately 1.28. C: 20% of the distribution lies below A. D: To get the middle 80%, we would have ?=−?.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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The 68‑95‑99.7 rule tells us how to find the middle 68%, 95%, or 99.7% of a Normal distribution. Suppose we wanted to find numbers A and B, so that the middle 80% of a standard Normal distribution lies between A and B, where A is less than B. Which of the answers below is not true of A and B?

A: 10% of the distribution lies above B.
B: B is approximately 1.28.
C: 20% of the distribution lies below A.
D: To get the middle 80%, we would have ?=−?.
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