Find mean and variance of total sustained load on footing

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Question: The total sustained load on the concrete footing of a planned building is the sum of the dead load plus the occupancy load. Suppose that the dead load X1 has a gamma distribution with a1 = 50 and ß1 = 2, whereas the occupancy load X2 has a gamma distribution witha2 = 20 andß2 = 2. (Units are in kips.) Assume that X1 and X2 are independent.

a. Find the mean and variance of the total sustained load on the footing.

b. Find a value for the sustained load that will be exceeded with probability less than 1/16.

Reference no: EM131558930

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