Living systems
a. violate the second law of thermodynamics.
b. are examples of a closed system.
c. decrease their entropy while increasing the entropy of the universe. d. violate the first law of thermodynamics.

Asynthetic fiber used in manufacturing carpet has tensile strength that is normally distributed with mean 75.5 psi and standard deviation 3.5 psi. how is the standard deviation of the sample mean changed when the sample size is increased from n equals 8 to n equals 47