A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution approximated by a normal curve. Find the percentage of bulbs that can be expected to last the period of time. Round to the nearest hundredth, if necessary. (3 points each) 9) Less than 460 hours 10) Between 500 hours and 675 hours 11) Greater than 500 hours