There Are an Average of 22

Multiple Choice

There are an average of 22.455 employees at 22 office furniture dealers in a province with a standard deviation of 18.52.If the number of employees can be approximated by a normal distribution,the 99% confidence interval for the true mean number of full-time employees at office furniture dealers would be _____.

A) [11.014,33.896]
B) [11.277,33.633]
C) [12.284,32.626]
D) [12.513,32.397]
E) [20.072,24.838]