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A parameter conversion is value equals raw count times 0.25 minus 20. A raw count of 400 corresponds to

  • A.380
  • B.80
  • C.100
  • D.120

Answer: B

Correct answer: 80

Apply the conversion in order, multiplying before subtracting:

\[ 400 \times 0.25 - 20 = 100 - 20 = 80 \]

The distractor 100 stops before the offset and 380 subtracts before multiplying. Every recorded parameter carries such a scaling, and it is specific to the aircraft and the installation - which is why a readout is meaningless without the correct data frame layout document, and why an investigation validates the converted values against independently known events.

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