According to the national bridge inspection standards (nbis), public bridges over 20 feet in length must be inspected and rated every 2 years. the nbis rating scale ranges from 0 (poorest rating) to 9 (highest rating). university of colorado engineers used a probabilistic model to forecast the inspection ratings of all major bridges in denver. (journal of performance of constructed facilities, feb. 2005.) for the year 2020, the engineers forecast that 9% of all major denver bridges will have ratings of 4 or below. use the forecast to find the probability that in a random sample of 10 major denver bridges, at least 3 will have an inspection rating of 4 or below in 2020.

Which expression is rational? 6. , square root two, square root 14, square root 49

Which set of lengths could represent the sides of a triangle? a. 3, 7, 10 b. 4, 5, 10 c. 6, 8, 14 d. 12, 6, 7

Which scenarios are most effectively explored by conducting an experiment? there is more than one correct answer. select all that apply. researchers want to study the effectiveness of a particular drug for treating migraines. they want to know which dosage of the drug yields the best results with the least side effects. to ensure fair results, the researchers want to ensure that participants and dosage administrators do not know which dosage participants receive. a teacher wants to plan a class fieldtrip and quickly determine where students prefer to go for the class fieldtrip. a car mechanic wants to know which of two engine brands makes better-performing engines. he wants to test the engines in identical situations and rate their performance in a way that can be fairly measured. a chemist studies the properties of a metal compound. she wants to know how the sample size of the metal affects its ability to conduct electricity. she wants to conduct the research in a controlled environment to minimize bias. a realty company wants to know the average income of its clients. the company wants to gather data income from current clients.