How do rechargeable batteries work differently from non-rechargeable ones?

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

If anyonee has done the momentum lab practical in physics can you give me the answers i am s lostt rnn : (

Which of the following statements correctly describes a transformer?