Irina rakes leaves for $9.75 per hour. she works 10 times per month, and each job lasts 2.25 hours. which equation would provide the best estimate of how many dollars irina earns each month? 9 × 10 × 2 = 180 9 × 10 × 3 = 270 10 × 10 × 2 = 200 10 × 10 × 3 = 300

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.