The irs is concerned with improving the accuracy of tax information given by its representatives over the telephone. previous studies involved asking a set of 25 questions of a large number of irs telephone representatives to determine the proportion of correct responses. historically, the average proportion of correct responses has been 70 percent. recently, irs representatives have been receiving more training. on april 26, the set of 25 tax questions were again asked of 20 randomly selected irs telephone representatives. the proportions of correct answers were: 21, 15, 19, 16, 16, 15, 21, 13, 17, 13, 24, 16, 22, 16, 15, 18, 23, 19, 21, and 16.a) what are the upper and lower control limits for the appropriate p-chart for the irs? use z = 3b) is the tax information process in statistical control?

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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."

Darlene has a balance of 3980 on a credit card with an apr of 22.8% paying off her balance and which of these lengths of time will result in her paying the least amount of interest?