Question: A video display tube for computer graphics terminals has a fine mesh screen behind the viewing surface. During assembly the mesh is stretched and welded

A video display tube for computer graphics terminals has a fine mesh screen behind the viewing surface. During assembly the mesh is stretched and welded onto a metal frame. Too little tension at this stage will cause wrinkles, and too much will tear the mesh. The tension is measured by an electrical device with output readings in milli volts (mV). The minimum acceptable tension corresponds to a reading of 200 mV. = 250 mV and = 50 mV. What proportion of tubes are acceptable?

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