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an engineer pulls 30 transistors off the assembly line and 4 are defective. The engineer then randomly selects 8 transistors to test.
a. how many different ways can the sample contain AT MOST 3 defective transistors?
B. if at least 2 of the selected transistors are defective, then the engineer will need to stop the production line of why there were more than 2 defective, fix the problem and report. What is the probability that the engineer will need to stop the production?
C. calculate the probability that 3 to 4 defective will be selected