A Seizure of Heroin Is Analyzed to Obtain the %Purity

question 6

Multiple Choice

A seizure of heroin is analyzed to obtain the %purity of the drug. An intermediate calculation involves the weight of the sample which is recorded at 75.54 mg. The balance uncertainty is 0.31 mg.
What is the relative uncertainty of the sample weight reported to two significant digits?

• A) 0.0024
• B) 243.7
• C) 0.4
• D) 0.0041
• E) None of the above

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Definitions:

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Smallest IQR

The smallest range between the first and third quartiles in a dataset, indicating the tightest concentration of the middle half of the data.

Reaction Time

The time elapsed between the presentation of a stimulus and the subsequent response to it.

Gas Pedal

A device in vehicles that controls the engine's speed, increasing acceleration when pressed.