The Aluminum Association reports that the average American uses 56.8 pounds of aluminum in a year. A random sample of50households is monitored for one year to determine aluminum usage. If the population standard deviation of annual usage is12.3pounds, what is the probability that the sample mean will be each of the following?

Appendix A Statistical Tables

a.More than59pounds

b.More than56pounds

c.Between55and58pounds

d.Less than53pounds

e.Less than48pounds

(Round the values of z to 2 decimal places. Round your answers to 4 decimal places.)

a.

enter the probability that the sample mean will bemore than59pounds

b.

enter the probability that the sample mean will be more than56pounds

c.

enter the probability that the sample mean will be between55and58pounds

d.

enter the probability that the sample mean will be less than53pounds

e.

enter the probability that the sample mean will be less than48pounds