Question

37 packages are randomly selected from packages received by a parcel service. The sample has a

Answer 1

True mean = mean+/- Z*(SD/sqrt (n))

Where
Z = 1.96 at 95% confidence interval
Mean = 10.3 pounds
SD = standard deviation = 2.4 pounds
n= sample size = 37 packages

Substituting;
True mean range = 10.3+/- 1.96 * 2.4/Sqrt (37) =10.3+/- 0.77 = 9.53<mean<11.07