The amount spent on textbooks for the fall term was recorded for a sample of five hundred university students. It was determined that the 75th percentile was the value 500. Which of the following interpretations of the 75th percentile is correct?
A) 75 of the students sampled had textbook costs that exceeded 500.
B) 75 of the students sampled had textbook costs equal to 500.
C) 25 of the students sampled had textbook costs that exceeded 500.
D) The average of the 500 textbook costs was 500.
Question 2
A recent survey found that 73 of all adults over 50 wear glasses for driving. In a random sample of 80 adults over 50, what is the mean and standard deviation of the number who wear glasses? Round to the nearest hundredth when necessary.
A) mean: 58.4; standard deviation: 7.64 B) mean: 21.6; standard deviation: 7.64
C) mean: 21.6; standard deviation: 3.97 D) mean: 58.4; standard deviation: 3.97
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