Answer:
a) 
b)

c) both the means of the two samples underestimate the population mean.
the mean pulse rate of sample 1 underestimates the population mean.
the mean pulse rate of sample 2 underestimates the population mean.
Step-by-step explanation:
i) population size, N = 9
a) 
b)

c) both the means of the two samples underestimate the population mean.
the mean pulse rate of sample 1 underestimates the population mean.
the mean pulse rate of sample 2 underestimates the population mean.