Can someone tell me if i’m correct on the three physics questions

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply

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