AP Statistics Review #4
AP Statistics Review #4 AP Statistics Review #4
1. Senior citizens make up about 13.4% of the American population. If a random sample of300 Americans is selected, what is the probability that more than 270 are NOT seniorcitizens.(A)(B)(C)(D)(E)
2. In the year’s county mathematics competition, a student scored 38; in last year’scompetition, the student scored 33. The average score this year was 36 with a standarddeviation of 2. Last year’s average score was 32 with a standard deviation of 1. In whichyear did the student score better?(A)The student scored better on this year’s exam.(B) The student scored better on last year’s exam.(C)The student scored equally well on both exams.(D)Without knowing the number of test items, it is impossible to determine the betterscore.(E) Without knowing the number of students taking the exam in the county, it isimpossible to determine the better score.
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1. Senior citizens make up about 13.4% of the American population. If a random sample of300 Americans is selected, what is the probability that more than 270 are NOT seniorcitizens.(A)(B)(C)(D)(E)