When the distance between an object and a flat mirror is 5 m, the distance between the image and the mirror is a. 5 m.
b. 7.5 m.
c. 10m.

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