The Actual Number of Hours That a Candle Will Burn

Multiple Choice

The actual number of hours that a candle will burn has an approximate normal distribution with a mean of 18 hours and a standard deviation of 1.2 hours. What is the probability that the candle will burn for Less than 14.4 hours? Give your answer as a percentage.

A) 0.15%
B) 2.5%
C) 15.85%
D) 99.7%
E) None of the above.