A purchasing manager at a university is investigating which brand of LCD projector to purchase for equipping classrooms. Of major concern to her is the lifetime of the light bulbs used in the projectors. One company has published the following histogram regarding the lifetimes of a sample of 50 bulbs used in its LCD projectors. ? Frequency 15- 10+ 5- 4 0 700 750 7 800 15 850 11 9 4 900 950 1000 Bulb lifetime (in hours) Based on the histogram, find the proportion of bulb lifetimes in the sample that are less than 950 hours. Write your answer as a decimal, and do not round your answer. Aa