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OpenStudy (anonymous):
Error Propogation problem: You measure your backyard to determine the amount of grass seed to buy. You measure the length to be 110m+/-3m and the width to be 270m +/-2m. The store sells seed bags that cover 100 square meters. How many bags do you need to buy to safely cover your lawn? Would remeasuring your yard to +/-1m in width and length save you any money?
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