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A forest products company claims that the amount of usable lumber in its harvested trees averages u=172 cubic feet and has standard deviation of o=12.4

A forest products company claims that the amount of usable lumber in its harvested trees averages u=172 cubic feet and has standard deviation of o=12.4 cubic feet. Assume that these amounts have approximately a normal distribution. What proportion of trees contains between 150 and 180 cubic feet? O .2422 O .4616 O .7038 O .7995

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