Snow Belt Airlines Weighed the Baggage of 100 Passengers and Found

Short Answer

Snow Belt Airlines weighed the baggage of 100 passengers and found the mean weight to be 34.2 pounds with a standard deviation of 14 pounds.What is the 95% confidence interval for the actual weight of the baggage? Round Z to the nearest whole number)
a) 20.0 - 48.2
b) 32.8 - 35.6
c) 31.4 - 37.0
d) 0.0 - 50.0