英语翻译
①：ResidentsoftownXparticipatedinasurveytodeterminethenumberofhoursperweekeachresidentspentwatchingtelevision.Thedistributionoftheresultsofthesurveyhadameanof21hoursandastandarddeviationof6hours.ThenumberofhoursthatPat,aresidentofTownX,watchedtelevisionlastweekwasbetween1and2standarddeviationsbelowthemean.WhichofthefollowingcouldbethenumberofhoursthatPadwatchedtelevisonlastweek?
②AcomputerchipmanufacturerexpectstheratioofthenumberofdefectivechipstothetotalnumberofchipsinallfutureshipmentstoequalthecorrespondingratioforshipmentsS1,S2,S3,S4combined,asshowninthetableabove.Whatistheexpectednumberofdefectivechipsinashipmentof60,000chips?
左起第一列：shipment
左起第二列：numberofdefectivechipsintheshipment
左起第三列：totalnumberofchipsintheshipment
S125,000
S2512,000
S3418,000
S4616,000