Math

The U.S. Department of
Defense makes use of statistics in designing weapon systems
for tanks and other forms of armor. By measuring
the results of the firing of a weapons system under simulated combat conditions, ballistics researchers can estimate the accuracy of the shells fired. If the design
specifications require that 99% of the shells fired fall within 1.5 meters of the target when the system is operating
properly, what is the maximum allowable standard deviation for the system?

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  1. ± 1.5 m = ± 2 SD = .99%

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