' Instructions Question 12 wing set of data. | Find the range of the follo 3.23, $15.60, $15.75 12.50, $13.23, 11.20, $14.50, $12.50. $1 I - L O * Question 13 1 pts The quiz scores for two different groups of math students are given below. Use the mean and standard deviation to determine which group has a higher average, and which group is more consistent. Group A - 93, 90, 71, 77, 85, 75, 77, 85, 87, 90 Group B - 71, 75, 85, 95, 71, 71, 90, 95, 87, 80 Group A had a higher average: Group A was more consistent Group A had a higher average: Group B was more consistent Group B had a higher average; Group A was more consistent Group B had a higher average; Group B was more consistent Exam Details Calculator O Webcam stv A MacBook OOO 20 F5 F4 F3 F2 % $ 5ted: Jun 27 at 10:39am uiz Instructions Show Instructions D Question 14 1 pts What is the standard deviation of the following data? If necessary, round your answer to two decimal places. 10, 16, 12, 15, 9, 16, 10, 17, 12, 15 3.45 2.98 2.79 3.21 Previous Next > Webcam Guard The Exam Details Calculator JUN V tv 27 MacBook 20 F 5 F4 F3 F2 $ % 5iz Instructions now Instructions Question 15 1 pts What is the standard deviation of the following data? If necessary, round your answer to two decimal places. 600, 470, 170, 430, 300 147.32 146.32 145.32 144.32 Previous Nextos ard The Exam Details Calculator O Webcam Cars N V stv A 7 MacBook 888 20 F5 F4 F3 F2 A $ %iz Instructions ow Instructions Question 16 1 pts What is the variance of the following data? If necessary, round your answer to two decimal places. 10, 16, 12, 15, 9, 16, 10, 17, 12, 15 7.86 0 7.76 7.56 7.66 Previous Next Calculator O Webcam ard Th Exam Details &tv A 7 MacBook 20 000 F5 F4 F3 F2 A % V 5iz Instructions ow Instructions Question 17 1 pts Suppose you have a normally distributed set of data pertaining to a standardized test. The mean score is 1000 and the standard deviation is 200. What is the z-score of 900 point score? 0.5 15 01 -0.5 Previous Next > Not saved Submit tv 7 MacBook 20 F5 F4 F3 F2 A # $ 5iz Instructions yw Instructions Question 18 o Suppose you have a normally distributed set of data pertaining to a Exam Details Calculator O Webcam ard The N tv A 7 MacBook 828 20 F5 F4 F3 F2 A $ %w Instructions Question 20 1 pts The average time between infection with the AIDS virus and developing AIDS has been estimated to be 8 years with a standard deviation of about 2 years. Approximately what fraction of people develop AIDS within 4 years of infection? 97.5% 5% 1% 2.5% Previous Next Not saved Submit N &tv 7 MacBook 20 F5 F4 F3 F2 $ % 5yw Instructions e e T ] e Ds has the normal distribution with 5 What is the relative frequency of utes? The playing time X of classical C 54 and standard deviation mean classical CDs with playing time X between 44 and 54 min ) 47.5% . o si.% \\ \\ o s0% .- \\ )52 5% ' \\/ \\ Next \" Previous AN s B B wE - - W yow Instructions D (s T at has a mean of 40 minutes, a d is normally distributed, how 0 minutes? \\f 1,000 students take a test th standard deviation of 8 minutes, an many would you expect would finish in less than 4 \\ O '250 \\ Q 500 | | om0 \\ | O 1000 .,,.-'-",,'/ od VL L R @t O '!":l;' 1