1 of 20 5.0 Points A grocery store will only accept yellow onions that are at least 2.75 in. in diameter. A grower has a crop of onions with diameters that are normally distributed, with a mean diameter of 3.25 in. and a standard deviation of 0.25 in. What percent of the onions will be accepted by the grocery store? A. 97.5% B. 16% C. 34% D. 2.5% Question 2 of 20 5.0 Points The scores on a final exam were approximately normally distributed with a mean of 82 and a standard deviation of 11. If 85 students took the exam, and above a 60 is a passing grade, how many students failed the exam? A. 13 B. 1 C. 2 D. 12 Question 3 of 20 5.0 Points Find the mean, median, and mode 15,3,11,15,1,14,7,2,1,1,2 A. mean = 6, median = 3, mode = 1 B. mean = 6, median = 3, mode = 8 C. mean = 6.5, median = 8, mode =1 D. mean = 6.5, median = 3, mode = 1 Question 4 of 20 5.0 Points Over the first five years of owning her car, Gina drove about 12,700 miles the first year, 15,478 miles the second year, 12,765 the third year, 11,850 the fourth year, and 13,075 the fifth year. a. Find the mean, median, and mode of this data. b. Explain which measure of central tendency will best predict how many miles Gina will drive in the sixth year. A. mean = 13,173.6 median = 12,765 no mode the median is the best choice because it is not skewed by the high outlier. B. mean = 13,173.6 median = 12,765 no mode the mean is the best choice because it is representative of the entire data set. C. mean = 12,700 median = 13,156 no mode the mean is the best choice because it is representative of the entire data set. D. mean = 13,173.6 median = 12,765 mode = 3,628 the median is the best choice because it is not skewed by the higher outlier. Question 5 of 20 5.0 Points Find the outlier of the data set 3.1, 5.3, 4.3, 0.7, 5.6, 5.2, 5.8, 5.4 A. 4.3 B. 5.3 C. 0.7 D. 5.4 Question 6 of 20 5.0 Points The bar graph shows the rents paid per month for apartments in an urban neighborhood. The curve shows that the rents are normally distributed. Estimate the percent of apartment residents who pay from $600 to $749 per month. A. 43% B. 25% C. 68% D. 93% Question 7 of 20 5.0 Points The height (in feet) of a sample of trees in the school playground: 12.5, 9.8, 13.5, 11.2, 12.3, 14.2, 11.7, 9.8, 12.6, 10.4 A. mean = 11.8 ft standard deviation = 1.43 ft B. mean = 11.8 ft standard deviation = 4.52 ft C. mean = 11.8 ft standard deviation = 4.52 ft D. mean = 13.1 ft standard deviation = 1.43 ft Question 8 of 20 5.0 Points The graph below displays how many pieces of candy Timmy and his five friends each received last Halloween. Within how many standard deviations of the mean do the values fall? A. 2 B. 1 C. 3 D. 4 Question 9 of 20 5.0 Points A class of 24 students wants to choose 3 students at random to bring food for a class party. Any set of 3 students should have an equal chance of being chosen. Which of the following strategies will result in a fair decision? A. Assign a number to each student. Write the numbers on slips of paper and put them all in a hat. Randomly choose three slips of paper. The students with those three number can bring the food. B. Arrange the students in a line. Start at one end and have each student flip a coin. The first three students to flip heads can bring the food. C. Ask the students to volunteer. The first three students to raise their hands can bring the food. D. None of the above Question 10 of 20 5.0 Points The bar graph shows the rents paid per month for apartments in an urban neighborhood. The curve shows that the rents are normally distributed. Estimate the percent of apartment residents who pay from $700 to $749 per month. A. 93% B. 68% C. 25% D. 3% Question 11 of 20 5.0 Points Mrs. Jones Algebra 2 class scored very well on yesterday's quiz. With one exception, everyone received an A. Within how many standard deviations from the mean do all the quiz grades fall? 91, 92, 94, 88, 96, 99, 91, 93, 94, 97, 95, 97 A. 2 B. 1 C. 3 D. 4 Researchers randomly choose two groups from 15 volunteers. Over a period of 9 weeks, one group watches television before going to sleep, and the other does not. Volunteers wear monitoring devices while sleeping, and researchers record dream activity. Which type of study method is described in each situation? A. controlled experiment B. Not enough information given. C. observational study D. survey Question 13 of 20 5.0 Points Make a box and whisker plot of the data. 24,18,29,21, 16,23,13,11 A. B. C. D. Question 14 of 20 5.0 Points Find the mean, median, and mode of the data set. Round to the nearest tenth. Test scores on a math exam: 88,89,65,62,83,63,84,63,74,64,71,82,66,88,79,60,86,63,93,99,60,85 A. mean = 69.5, median = 76.5, mode = 79.5 B. mean = 75.8, median =76.5, mode = 63 C. mean = 69.5, median = 76.5, mode = 63 D. mean = 75.8, median = 89.5, mode = 6 Question 15 of 20 5.0 Points Two students in different classes took the same math test. Both students received a score of 87. In student A's class the mean was 78 and the standard deviation of 5. In student B's class the mean was 76 with a standard deviation of 4. Which student scored in the top 10% of their class? A. Neither student B. Both students C. Student A D. Student B Question 16 of 20 5.0 Points Use a calculator to find the mean and standard deviation of the data. Round to the nearest tenth. 6,7,19,7,18,7 A. mean = 9 standard deviation = 26.4 B. mean = 11.9 standard deviation = 26.4 C. mean = 10.6 standard deviation = 6.1 D. mean = 9 standard deviation = 5.1 Question 17 of 20 5.0 Points Susan keeps track of the number of tickets sold for each play presented at The Community Theater. Within how many standard deviations from the mean do all the values fall? 135, 71, 69, 80, 158, 152, 161, 96, 122, 118, 87, 85 A. 3 B. 4 C. 5 D. 2 Question 18 of 20 5.0 Points Students ask every 5th person to board the train what their favorite color is. Which type of study method is described in each situation? A. None of the above. B. controlled experiment C. observational study D. survey Question 19 of 20 5.0 Points Use a calculator to find the mean and standard deviation of the data. Round to the nearest tenth. 946, 726, 956, 519, 104, 415, 428, 457, 614, 201, 772, 801 A. mean = 578.3 standard deviation = 68572.4 B. mean = 566.5 standard deviation = 261.9 C. mean = 578.3 standard deviation = 261.9 D. mean = 566.5 standard deviation = 68572.4 Question 20 of 20 5.0 Points Use a calculator to find the mean and standard deviation of the data. Round to the nearest tenth. 20, 16, 18, 9, 20, 16,14 A. mean = 16.1 standard deviation = 3.6 B. mean = 16.1 standard deviation = 12.7 C. mean = 15.9 standard deviation = 3.6 D. mean = 16 standard deviation = 12