A Random Sample of N Measurements Was Selected from a Population

Short Answer

A random sample of n measurements was selected from a population with unknown mean μ and known standard deviation σ. Calculate a 95% confidence interval for μ for the given situation. Round to the nearest hundredth when necessary. $n = 100 , \bar { x } = 58 , \sigma = 20$
A) $58 \pm 3.92$
B) $58 \pm 3.29$
C) $58 \pm 39.2$
D) $58 \pm 0.39$