The data on the following page represent the pulse rates (beats per minute) of nine students enrolled in a section of Sullivan's course in Introductory Statistics. Treat the nine students as a population.

Student Pulse

Perpectual Bempah............................76

Megan Brooks.................................60

Jeff Honeycutt.................................60

Clarice Jefferson...............................81

Crystal Kurtenbach............................72

Janette Lantka.................................80

Kevin McCarthy................................80

Tammy Ohm...................................68

Kathy Wojdyla................................73

(a) Determine the population standard deviation.

(b) Find three simple random samples of size 3, and determine the sample standard deviation of each sample.