31. A blood bank is conducting a study on how much time is required of their patients for blood platelet donations. Based on past records, time spent in the waiting room has a mean of 5 minutes and a standard deviation of 1 minute, time spent with a nurse who reviews patients' medical records and measures their vital signs has a mean of 10 minutes and a standard deviation of 3 minutes, and the actual donation time has a mean of 130 minutes and a standard deviation of 8 minutes. Assuming these three times are independent and can all be modeled using a normal distribution, approximately what proportion of donors finish the entire donation process in under 2.5 hours (150 minutes)?
(A) 0.66
(B) 0.72
(C) 0.84
(D) 0.89
(E) 0.99
32. In June 2016, residents of the United Kingdom (UK) voted to leave the European Union (EU). However, 48.1% of the UK population voted to remain in the EU. In a random sample of 4399 eligible voters in the city of London, 3312 favor remaining in the EU. Which of the following expressions gives the test statistic for the appropriate test to determine if the proportion of 'remainers' in the city of London differs significantly from the proportion of the UK population who voted to remain in the EU?
33. The average daily high temperature in degrees Celsius (C) during the month of July was recorded for the 51 largest cities in the United States. Summary measures are shown below.
Which of the following represents the median and interquartile range (IQR) of these average daily high temperatures in degrees Fahrenheit (F), where F = (9/5)C + 32?
(A) Median = 52.8°F, IQR = 9°F
(B) Median = 52.8°F, IQR = 41°F
(C) Median = 87.8°F, IQR = 5°F
(D) Median = 87.8°F, IQR = 9°F
(E) Median = 87.8°F, IQR = 41°F
34. In a large introductory statistics course at one university, 26% of the students are Biology majors, 43% of the students are sophomores, and 32% of the sophomores are Biology majors. If a student in this class is selected at random, approximately what is the probability that the selected student is a sophomore majoring in Biology?
(A) 0.08
(B) 0.14
(C) 0.32
(D) 0.37
(E) 0.74
35. In a large city, researchers selected a random sample of 120 individuals who have multiple televisions in their house connected to a streaming device. Each individual was asked how many hours of streaming content they watch in a typical week. The sample had a mean of 12.5 hours. For which of the following populations is 12.5 hours a reasonable estimate of the mean hours of weekly streaming content watched?
(A) All individuals who regularly watch streaming content
(B) All individuals from this city who regularly watch streaming content
(C) All individuals from this city with multiple streaming devices in their house
(D) All individuals from this city with multiple streaming devices in their house who regularly watch streaming content
(E) All 120 individuals in this city with multiple streaming devices in their home who regularly watch streaming content
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