(Solved):   Find the minimum sample size \( n \) needed to estimate \( \mu \) for the given values of \( ...

Find the minimum sample size \( n \) needed to estimate \( \mu \) for the given values of \( c, \sigma \), and \( E \). \[ c=0.95, \sigma=9.7 \text {, and } E=1 \] Assume that a preliminary sample has at least 30 members. \[ n=\quad \text { (Round up to the nearest whole number.) } \]