A certain characteristic in a large population has a distribution that is symmetric about the mean m. 68 percent of the distribution lies within one standard deviation d of the mean. If the shelf's average life is 9.6 years and the standard deviation is 2.1 years, what percent of the distribution has more than 11.7 years as a shelf's average life?
A. 10%
B. 12%
C. 14%
D. 16%
E. 18%
* A solution will be posted in two days.
A certain characteristic in a large population has a distrib
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A certain characteristic in a large population has a distribution that is symmetric about the mean m. 68 percent of the distribution lies within one standard deviation d of the mean. If the shelf's average life is 9.6 years and the standard deviation is 2.1 years, what percent of the distribution has more than 11.7 years as a shelf's average life?
A. 10%
B. 12%
C. 14%
D. 16%
E. 18%
Like the above picture, what is bigger than 11.7 is 0.16=16%.
Thus, D is the answer.
A. 10%
B. 12%
C. 14%
D. 16%
E. 18%
Like the above picture, what is bigger than 11.7 is 0.16=16%.
Thus, D is the answer.
Math Revolution
The World's Most "Complete" GMAT Math Course!
Score an excellent Q49-51 just like 70% of our students.
[Free] Full on-demand course (7 days) - 100 hours of video lessons, 490 lesson topics, and 2,000 questions.
[Course] Starting $79 for on-demand and $60 for tutoring per hour and $390 only for Live Online.
Email to : [email protected]