Multiple Choice
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) ?
A) 3.89
B) 6.01
C) 8.78
D) 17.00
E) None of the choices are correct.
Correct Answer:
Verified
Correct Answer:
Verified
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