21. How large of a sample is needed to estimate the population mean for the money a person spends on Christmas presents within $2 and be 95% confident? The standard deviation of the population is $7.50. О А. 54 О В. 54 С. 55 D. 56

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Beams

In structural engineering, a beam is a component made of a variety of materials (including steel alloys, and wood) that can resist loads applied laterally to the beam axis. Members, elements, rafters, shafts, and purlins are all terms used to describe beams.