Final answer:
The minimum ceiling height along a means of egress is determined based on building codes and regulations. For designing the 757, the result from part (b) of the question is more relevant.
Step-by-step explanation:
The minimum ceiling height along a means of egress is determined by building codes and regulations.
To calculate the mean doorway height that would allow 95 percent of men to enter the aircraft without bending, engineering and anthropometric data is considered. This data takes into account the average height and body proportions of the male population. Similarly, in part (b), the mean doorway height is calculated based on the probability that it is greater than the mean height of 100 men.
For engineers designing the 757, the result from part (b) is more relevant.
This is because part (b) takes into account the probability that the height is greater than the mean height of 100 men, which provides a more accurate estimate for ensuring accessibility and ease of entrance for male passengers.