The cost in hundreds of dollars of this downtime due to


During an 8-hour shift, the proportion of time X that a sheet-metal stamping machine is down for maintenance or repairs has a beta distribution with and β. That is,

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The cost (in hundreds of dollars) of this downtime, due to lost production and cost of maintenance and repair, is given by
C = 10 + 20X + 4X 2.

a Find the mean and variance of C.

b Find an interval in which C will lie with probability at least 0.75.

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Electrical Engineering: The cost in hundreds of dollars of this downtime due to
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