Statics- Data analysis

© 2009 -2011 tutorco.com 1 Q1. The manager of a video shop recorded the number of blank tapes sold per day in 2 weeks. Find the mode for the data: 132, 121, 119, 116, 130, 121, 131, 117, 119, 135, 121, 129, 119, 134 a) There is no mode b) 119 c) 131 d) Modal values are 119 and 121 Q2. The average annual wind speed for the 5 windiest cities in the U.S. is given below in miles per hour. What is the mean of these speeds? 15.4, 14.0, 13.5, 13.1, 12.9 a) 13 b) 13.78 c) 14 d) None Stats_3_Pre STATISTICS TOPIC: DATA ANALYSIS © 2009 -2011 tutorco.com 2 Q3. The given stem-and-leaf plot shows grades that students received on a math quiz. Number of students scored at least 92 on the math quiz are: Test Scores Stem Leaves 3 1 4 5 6 6 2 7 7 0 5 8 3 2 9 5 7 0 9 2 8 4 1 6 9 10 0 a) 5 b) 7 c) 1 d) 6 Q4. What is the value of n for the data 11, 10, 10, 12, 9, 16, and n if mean = 12 and median = 11 a) 16 b) 15 c) 11 d) 10 © 2009 -2011 tutorco.com 3 Q5. A teacher gives a test for which the mean of the scores is 72 and the standard deviation is 16. The teacher decides to scale the test scores by adding 8 points to each score. What are the mean and standard deviation of the scaled test scores? a) 50 and 16 b) 80 and 24 c) 80 and 16 d) 72 and 24