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Mathematics 11 Online
OpenStudy (khameleon):

Should an estimate or the exact answer be calculated? Then do the appropriate calculation. A charity raised money for a 6 week period. The group had a goal of collecting at least $500. They collected $69.75 in each of the first two weeks and $74.35 in each of the last four weeks. Did the charity reach it's goal? A. The exact answer is needed to know if the goal was reached. $436.90 was collected. B. An estimate can be used to know if the goal was reached. 70• 2 + 75 • 4 = 440 At most $440 was collected.

OpenStudy (davejavous):

In this particular example, calculating it exactly takes no extra time than estimating it, so I would just do it exactly. Estimation in the real world is pretty much only used if input data is incomplete, for example, when they were halfway through, they collected $69.75 then $69.75 then $74.35 each week respectively. They could estimate that the next 3 weeks would raise approximately $72 a week, for example.

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