题目

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

提问时间：2020-08-07

答案

1.X市市民参与一项每周每人花费几个小时看电视的调查.调查结果的分布为平均数21,标准差6.X市其中一个市民Pat,上周看电视的时间低于平均数1和2个标准差之间.下面哪个数据可能是Pat上周看电视的时间?（应该为9和15之间...