Each person who applies for an assembly job at Robert's Electronics is given a mechanical aptitude test. One part of the test involves assembling a plug-in unit based on numbered instructions. A sample of the length of time it took 42 persons to assemble the unit was organized into the following frequency distribution. 
What is the standard deviation (in minutes) ?
Definitions:
Egalitarian
Relating to or believing in the principle that all people are equal and deserve equal rights and opportunities.
Social Justice
The equitable distribution of wealth, opportunities, and privileges within a society, aiming at fairness and equality in human rights.
Artificial Termination
The intentional ending of a process or activity before it naturally concludes, often used in medical contexts to refer to procedures like abortion.
Pregnancy
The condition of having a developing embryo or fetus in the body, typically lasting about 40 weeks in humans from the last menstrual period to childbirth.
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