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:
Market Value
The present rate at which a company or asset is available for purchase or sale on the market.
Book Value
The net value of a company's assets minus its liabilities, often used to assess a company's financial health.
Dividend Income
Income received from owning shares in a corporation, typically paid out from the company's profits.
Shares Purchased
Refers to the acquisition of ownership units in a corporation, typically through transactions on stock exchanges.
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