In a Laboratory Accident, a Work Area Is Contaminated with |

question 148

Multiple Choice

$\begin{array} { | l | c | c | c | c | c | c | } \hline \text { Time (days) } & 0 & 2 & 6 & 11 & 19 & 30 \\\hline \text { Counts per } & & & & & & \\\text { Minute } & 1000 & 899 & 726 & 556 & 356 & 200 \\\hline\end{array}$
In a laboratory accident, a work area is contaminated with radioactive material. Health physicists monitor the area during a 30-day period and obtain the data shown in the table. The accident occurred at time t = 0 days. They determine that it will not be safe for workers to enter the area until the radioactivity level has dropped to 16 counts per minute. Of the choices listed, which one is the earliest time after the accident that workers could safely return?

• A) 77 days
• B) 90 days
• C) 102 days
• D) 65 days
• E) 48 days

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Definitions:

Sample Size

The number of observations or data points collected in a statistical study, which impacts the study's reliability and the precision of its estimates.

Control Limits

Statistical boundaries set in process control charts that distinguish between normal and non-normal variations in the process.

Standard Deviation

A measure of the amount of variation or dispersion in a set of values.

Nonconforming Items

Products or outputs that do not meet the specified requirements or standards.