What is the main objective of performing a time study? How do industrial engineers typically use the time study results?

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Assume that the insulation panels from questions $2$ & $3$ are $36"$x$40".$

$$b$.)$ Based on the total standard time for the $5$ elements, how many labor hours would you expect for a $300$ sq$.$ ft$.$ installation?

c$.)$ What would the efficiency be if the job was completed in $0\mathrm{.}5$ hours?

Partial credit for incorrect answers will be given based on your submission for question $2.$