Learning Materials
Features
Discover
Chapter 6: Q 18 (page 385)
Suppose X ~ N(2, 3). What value of x has a z-score of –0.67?
The value of x is
Over 30 million students worldwide already upgrade their learning with Vaia!
All the tools & learning materials you need for study success - in one app.
Get started for free
The patient recovery time from a particular surgical procedure is normally distributed with a mean of days and a standard deviation of days.
The percentile for recovery times is
a. 8.89
b. 7.07
c. 7.99
d. 4.32
Use the following information to answer the next two exercises: The life of Sunshine CD players is normally distributed with mean of 4.1 years and a standard deviation of 1.3 years. A CD player is guaranteed for three years. We are interested in the length of time a CD player lasts.
In , students took the SAT exam. The distribution of scores in the verbal section of the SAT had a mean and a standard deviation . Let X = a SAT exam verbal section score in . Then . Find the z-scores for and. Interpret each z-score. What can you say about and as they compare to their respective means and standard deviations ?
About what percent of the x values from a normal distribution lie within two standard deviations (left and right) of the mean of that distribution?
In a normal distribution, x = 3 and z = 0.67. This tells you that x = 3 is ____ standard deviations to the ____ (right or left) of the mean.
What do you think about this solution?
We value your feedback to improve our textbook solutions.
Explanations 
Textbooks 
Exams 
GCSE 
IGCSE 
AS 
A Level 
International A Level 
University Admissions Tests 
Flashcards 
Vaia AI 
Notes 
Study Plans 
Study Sets 
Find a job 
Find a degree 
Student Deals 
Magazine 
Mobile App