Blocks of concrete are tested for conformance to strength specifications. The outcomes of the test are considered independent, and the probability of a concrete block conforming to strength specifications is 0.85 a. What is the probability that exactly 5 concrete blocks are tested to obtain 3 concrete blocks that conforms to strength specifications? b. Suppose one needs 4 consecutive concrete blocks conforming to strength specifications, what is the probability that exactly 8 tests (for 8 concrete blocks) are necessary?

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