Virginia’s Ron McPherson Electronics Corporation retains a service crew to repair machine breakdowns that occur on average l = 3 per 8-hour workday (approximately Poisson in nature). The crew can service an average of m = 8 machines per workday, with a repair time distribution that resembles the negative exponential distribution.
a) What is the utilization rate of this service system?
b) What is the average downtime for a broken machine?
c) How many machines are waiting to be serviced at any given time?
d) What is the probability that more than 1 machine is in the system? The probability that more than 2 are broken and waiting to be repaired or being serviced? More than 3? More than 4?

Martha is the head of the accounts department in a small manufacturing company. the company follows the accrual-basis method of accounting. it recently purchased raw materials worth $5,000 from its vendors. however, the company paid only $3,000 to its vendors. it plans to pay the remaining amount after three months. considering this information, which entry should martha record in the company’s accounts? a. $5,000 as accounts receivable b. $3,000 as accounts payable c. $2,000 as accounts payable d. $2,000 as accounts receivable

Which of the following are considered needs? check all that apply

Richardson hired j.c. flood company, a plumbing contractor, to correct a stoppage in the sewer line of her house. the plumbing company's 'snake' device, used to clear the line leading to the main sewer, became caught in the underground line. to release it, the company excavated a portion of the sewer line in richardson's backyard. in the process, the company discovered numerous leaks in a rusty, defective water pipe that ran parallel with the sewer line. to meet public regulations, the water pipe, of a type no longer approved for such service, had to be replaced either then or later, when the yard would have to be excavated again. the plumbing company proceeded to repair the water pipe. though richardson inspected the company's work daily and did not express any objection to the extra work involved in replacing the water pipe, she refused to pay any part of the total bill after the company completed the entire operation. j.c. flood company then sued richardson for the costs of labor and material it had furnished. (c) for what, if anything, should richardson be liable? explain."