The Average Time Taken for Your Internet Service Provider to Remotely

Multiple Choice

The average time taken for your Internet service provider to remotely resolve a trouble ticket has a Normal distribution, with a mean of 4.3 hours and a standard deviation of 3.1 hours. What percentage of the tickets are resolved in less than half an hour?

A) 11.0%
B) 14.5%
C) 85.5%
D) 89.1%