A Random Sample of 144 Observations Has a Mean of 20

Multiple Choice

A random sample of 144 observations has a mean of 20, a median of 21, and a mode of 22. The population standard deviation is known to equal 4.8. The 95.44% confidence interval for the population mean is

A) 15.2 to 24.8
B) 19.200 to 20.800
C) 19.216 to 20.784
D) 21.2 to 22.8