Probabilistic model to forecast the inspection ratings

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1. A national standard requires that public bridges over 20 feet in length must be inspected and rated every 2 years. The rating scale ranges from 0(poorest rating) to 9(highest rating). A group of engineers used a probabilistic model to forecast the inspection ratings of all major bridges in a city. For the year2020, the engineers forecast that 55% of all major bridges in that city will have ratings of 4 or below. Complete parts a and b.

a. Use the forecast to find the probability that in a random sample of 88 major bridges in thecity, at least 3 will have an inspection rating of 4 or below in 2020. P(xgreater than or equals≥3)equals=nothing (Round to five decimal places as needed.)

Reference no: EM131429361

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