Final answer:
The minimum square footage for a landing to an entry door is typically determined by the IRC and local building codes, with a minimum width equivalent to the door's width and usually 36 inches in the direction of travel. The mentioned 819,200 square feet appears unrelated and likely erroneous.
Step-by-step explanation:
The question regarding the minimum number of square feet for a landing to an entry door doesn't have a standard answer since it is normally determined by local building codes and the International Residential Code (IRC). Generally, landings must be at least as wide as the door and a minimum of 36 inches measured in the direction of travel out of the door. However, the reference to 819,200 square feet appears to be a non-related figure, likely a typographical error, as this would represent an excessively large area far beyond practical or code requirements for an entry door landing.
In the context of a math problem focusing on scale or ratio, such as finding the wing span of a model airplane based on a real plane's size and a given scale factor, the process would involve multiplying the real wing span by the scale factor to get the model's wing span in the same units, and then converting it to the desired units like inches.
When discussing doorway height for aircraft such as in engineering problems for the 757 airplane, statisticians and engineers may calculate a mean doorway height using a normal distribution to include a certain percentage of the population. This involves considering anthropometric data (like the heights of men) and applying statistical concepts to determine an optimal height that accommodates most passengers without the need to bend. The result from part (b) of the question would be more relevant because it accounts for the specific passenger demographic on the aircraft.