Question

The accompanying data represent the pulse rates (beats per minute) of nine students. Treat the nine students as a population Compute the z-scores for all the students. Compute the mean and standard deviation of these z-scores Click the icon to view the data table. i Pulse Rates Compute thez-scores for all the students. Complete the table. Student Student z-score 2-score Student 1 Student 6 Student 2 Student 7 Student Pulse Student 3 Student 1 77 Student 8 Student 2 60 Student 4 Student 9 Student 3 60 Student 5 Student 4 (Round to the nearest hundredth as needed) Student 5 73 Student 6 Compute the mean of these z-scores Student 7 The mean of the z-scores is Student 8 (Round to the nearest tenth as needed ) Student 9 73 Compute the standard deviation of these z-scores The standard deviation of the z-scores is (Round to the nearest tenth as needed) Print Done 8 85R 88 82

Answer 1

L (х— х)2 Student Pulse(x) Student 1 77 20.75309 Student 2 60 154.8642 Student 3 60 154.8642 Student 4 81 73.19753 Student 5 73 0.308642 Student 6 80 57.08642 Student 7 80 57.08642 Student 8 68 19.75309 Student 9 73 0.308642 Total 652 538.2222 Mean /n 652/9 =72.4444 538.2222 67.2778 Variance - £(х-х)2 9-1 п-1 Standard deviation (s) =VVariance = 67.2778 8.2023

х—Меаn Pulse(x) Student Z Score S Student 1 77 0.56 Student 2 60 -1.52 Student 3 60 -1.52 Student 4 1.04 81 Student 5 73 0.07 Student 6 80 0.92 Student 7 0.92 80 Student 8 -0.54 68 Student 9 73 0.07 Mean of z score =0 Standard deviation of the z sore 1