There were many factors that allowed the Byzantine Empire to last a 1000 years after the end of the Roman Empire which include the fact that Constantinople, the capital of the Byzantine Empire, was protected with walls that lasted almost the entire 1000 years, making Constantinople, and the center of the empire's economy/culture impervious to invaders.
Answer:
Option A. 81.5%
Explanation:
Population mean, 
Standard deviation, 
The question is to find 
The z value is given by the formula:

z - value corresponding to the mean,
:

z - value corresponding to the mean,
:


Probability that an employee’s hourly wage is between $5.65 and $7.30 = 81.5%