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  3. multipart question please show explanation and step by step work...

Question: multipart question please show explanation and step by step work...

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Multi-part question:

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5. A drag racer has two parachutes, a main and a backup, that are designed to bring the vehicle to a stop after the end of a run. Suppose that the main chute deploys with probability 0.90 and that if the main fails to deploy, the backup deploys with probability 0.90. a. Find the probability that the backup parachute deploys? b. What is the probability that one of the two parachutes deploys?

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