1. A blood pressure test was given to 450 women ages 20 to 36. It showed that their mean systolic blood pressure was 120.0 mm Hg, with a standard deviation of 13.0 mm Hg. (a) Determine the z-score, to the nearest hundredth, for a woman who had a systolic blood pressure reading of 113.5 mm Hg.

(b) The z-score for one woman was 2.16. What was her systolic blood pressure reading? (Round your answer to one decimal place.)

2. A random sample of 50 tires showed that the mean mileage per tire was 41,200 mi, with a standard deviation of 4800 mi.

(a) Determine the z-score, to the nearest hundredth, for a tire that provided 46,700 mi of wear.

(b) The z-score for one tire was −2.52. What mileage did this tire provide? Round your result to the nearest hundred miles.

3. On a reading test, Shaylen's score of 455 was higher than the scores of 4298 of the 7258 students who took the test. Find the percentile, rounded to the nearest percent, for Shaylen'

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.