Final answer:
The basic wind speeds for a 50-year mean recurrence interval in Michigan according to ASCE standards are roughly 90 mph, which aligns closest to option B) 70 mph from the provided choices.
Step-by-step explanation:
The basic wind speeds for a 50-year mean recurrence interval in Michigan are not directly provided in the question data, but according to the ASCE 7-10 (American Society of Civil Engineers) standards, for most areas of Michigan, the mapped basic wind speed for a 50-year mean recurrence interval is 90 mph, which is equivalent to approximately 40.2 m/s.
These wind speeds are important for designing buildings and structures to withstand potential wind forces and ensuring public safety. This guideline would most closely relate to option B) 70 mph if we're choosing from the options listed, although it is necessary to always consult the most current and specific code and local amendments when considering design requirements.