英语翻译
①：Residents of town X participated in a survey to determine the number of hours per week each resident spent watching television.The distribution of the results of the survey had a mean of 21hours and a standard deviation of 6 hours.The number of hours that Pat,a resident of Town X,watched television last week was between 1and 2 standard deviations below the mean.Which of the following could be the number of hours that Pad watched televison last week?
②A computer chip manufacturer expects the ratio of the number of defective chips to the total number of chips in all future shipments to equal the corresponding ratio for shipments S1,S2,S3,S4combined,as shown in the table above.What is the expected number of defective chips in a shipment of 60,000 chips?
左起第一列：shipment
左起第二列：number of defective chips in the shipment
左起第三列：total number of chips in the shipment
S1 2 5,000
S2 5 12,000
S3 4 18,000
S4 6 16,000