MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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I understand part A, but I need assistance with part B. Please explain each of the three blanks.

The mean playing time for a large collection of compact discs is 33 minutes, and the standard deviation is 3 minutes.
(a) What value (in minutes) is 1 standard deviation above the mean? One standard deviation below the mean? What values are 2 standard deviations away from the mean?
36
1 standard deviation above the mean
1 standard deviation below the mean
30
2 standard deviations above the mean
39
2 standard deviations below the mean
27
Less than 24 min or greater than 42 min?
%
(b) Assuming that the distribution of times is mound shaped and approximately symmetric, approximately what percentage of times are between 27 and 39 minutes? (Hint: See
Example 3.19. Use the Empirical Rule.)
95
%
Less than 24 min?
✔ min
✔
min
min
min
%
✓
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Transcribed Image Text:The mean playing time for a large collection of compact discs is 33 minutes, and the standard deviation is 3 minutes. (a) What value (in minutes) is 1 standard deviation above the mean? One standard deviation below the mean? What values are 2 standard deviations away from the mean? 36 1 standard deviation above the mean 1 standard deviation below the mean 30 2 standard deviations above the mean 39 2 standard deviations below the mean 27 Less than 24 min or greater than 42 min? % (b) Assuming that the distribution of times is mound shaped and approximately symmetric, approximately what percentage of times are between 27 and 39 minutes? (Hint: See Example 3.19. Use the Empirical Rule.) 95 % Less than 24 min? ✔ min ✔ min min min % ✓
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