In which of these situations does a roller coaster have the most kinetic energy? a. climbing up the first hill b. at the top of the first hill c. half-way down the first hill d. at the bottom of the first hill

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