Determine the weight of the weighted arithmetic mean if the angles and their wei

Question

Determine the weight of the weighted arithmetic mean if the angles and their weights are given as 40˚56ꞌ2ꞌꞌ, 40˚56ꞌ7ꞌꞌ, 40˚56ꞌ12ꞌꞌ and 5, 4, 9 respectively.

Options:

A . 13

B . 18

C . 81

D . 10

Answer: Option B
Answer: (b).18

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