|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
25 Sep 2024, 07:43
Kudos
Bookmarks
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
(N/A)
Question Stats:
0% (00:00) correct
100% (01:51) wrong based on 1 sessions
History
Date
Time
Result
Not Attempted Yet
For a certain distribution, the measurement 12.1 is 1.5 standard deviations below the mean, and the measurement 17.5 is 3.0 standard deviations above the mean. What is the mean of the distribution?
A. 13.8
B. 13.9
C. 14.0
D. 14.1
E. 14.2
A. 13.8
B. 13.9
C. 14.0
D. 14.1
E. 14.2
27 Oct 2024, 03:33
Kudos
Bookmarks
OE
If m represents the mean of the distribution and s represents the standard deviation, then the statement “the measurement 12.1 is 1.5 standard deviations below the mean” can be represented by the equation 12.1 = m - 1.5s. Similarly, the statement “the measurement 17.5 is 3.0 standard deviations above the mean” can be represented by the equation 17.5 = m + 3.0s.
One way to solve the two linear equations for m is to eliminate the s. To do this, you can multiply the equation 12.1 = m - 1.5s by 2 and then add the result to the equation 17.5 = m + 3.0s to get 41.7 = 3m. Solving this equation for m gives the mean 13.9. Tus the correct answer is Choice B.
If m represents the mean of the distribution and s represents the standard deviation, then the statement “the measurement 12.1 is 1.5 standard deviations below the mean” can be represented by the equation 12.1 = m - 1.5s. Similarly, the statement “the measurement 17.5 is 3.0 standard deviations above the mean” can be represented by the equation 17.5 = m + 3.0s.
One way to solve the two linear equations for m is to eliminate the s. To do this, you can multiply the equation 12.1 = m - 1.5s by 2 and then add the result to the equation 17.5 = m + 3.0s to get 41.7 = 3m. Solving this equation for m gives the mean 13.9. Tus the correct answer is Choice B.
