5. Energy Solutions manufactures LED light bulbs. The profit p, in thousands of dollars earned, is a function of the number of bulbs sold, x, in ten
thousands. Profit is modeled by the function – x3 + 9x2 - 11x - 21.
For what number of bulbs manufactured does the company make a profit?

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.