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A test of weld strength involves loading welded joints until a fracture occurs. For a certain type of weld, 80% of the fractures occur in the weld itself, while the other 20% occur in the beam. A number of welds are tested and the tests are independent. Let X be the number of test at which the first beam fracture is observed. 5. IIM a) Find P(X23). b) Find E(X and V(x)

math   Statistics-And-Probability   
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is obser reel 1,2 , 3 PLx.ng. Þqx-1 wl ure. χ. with Þ-4 Lo)25 25e0 eo s 2 ト2 トト2ー ド トト2 ト2

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