In a high-speed coating system, the mass flowrate of polyester powder has an average value of $120
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In a high-speed coating system, the mass flowrate of polyester powder has an average value of $120 \mathrm{gm} / \mathrm{sec}$. There is a $75 \%$ probability the flowrate is between $110 \mathrm{gm} / \mathrm{sec}$. and $130 \mathrm{gm} / \mathrm{sec}$. What is the variance of the power flowrate? Assume the flowrate is normally distributed.
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