Concrete blocks are produced in lots of 1000. Each block has probability of 0.90 of meeting a strength specification. The blocks are independent. a. What is the probability that, in a given lot, fewer than 890 blocks meet the specification? b. Find the 80th percentile of the number of blocks that meet the specification. c. In a group of eight lots, what is the probability that fewer than 890 blocks meet the specification in two or more of them?

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