Question 4730 Deck General
70% to passA semisubmersible, 200 feet in length between draft marks with the LCF 10 feet aft of amidships, records the following drafts: Port Forward 64'-9"; Port Aft 68'-9"; Starboard Forward 59'-9"; and Starboard Aft 63'-9". What is the true mean draft?
A
64.25 feet
B
64.45 feet
C
64.75 feet
D
64.90 feet
AI Explanation
The correct answer is B) 64.45 feet. To calculate the true mean draft, you need to find the average of the four recorded drafts. The formula for this is: True Mean Draft = (Port Forward + Port Aft + Starboard Forward + Starboard Aft) / 4 Plugging in the given values: True Mean Draft = (64'-9" + 68'-9" + 59'-9" + 63'-9") / 4 = 256'-9" / 4 = 64.45 feet The other options are incorrect because they do not properly calculate the average of the four recorded drafts. Option A) 64.25 feet and Option C) 64.75 feet are incorrect calculations, while Option D) 64.90 feet is too high based on the information provided.
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