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.

Student	Pulse
Student 1	77
Student 2	61
Student 3	60
Student 4	81
Student 5	72
Student 6	80
Student 7	80
Student 8	68
Student 9	73

Answer 1

as z score =(X-mean)/standard deviation

therefore:

student	z score
student 1	0.57
student 2	-1.43
student 3	-1.55
student 4	1.07
student 5	-0.05
student 6	0.94
student 7	0.94
student 8	-0.55
student 9	0.07

mean these​ z-scores =0

standard deviation of these​ z-scores =1