In an assembly line production of industrial robots, gear-box assemblies can be installed in one minute each if the hole

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answerhappygod
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In an assembly line production of industrial robots, gear-box assemblies can be installed in one minute each if the hole

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In an assembly line production of industrial robots, gear-boxassemblies can beinstalled in one minute each if the holes have been properlydrilled in the boxes and In10 minutes each If the holes must be re-drilled. Twenty gear boxesare in stock and It isassumed that two will possess improperly drilled holes. Five gearboxes must beselected from the twenty avallable for installation in the nextfive robots in line.a. Find the probability that all five gear boxes will fitproperly.b. Find the expected value, the valance and the standard deviationof the time it willtake to install these five gear boxes.
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