有1130个选民,给两个东东选YES or NO, 有340个选了两个NO。问有多少个选了双YES的 1)有585个人在第一组里选了yES 2) 有7&& 个人在第二组里选了YES 选C吧
last question: DS: Sarah travels certain distance at a certain speed in mph. Ask if her error of estimate of time is less than 0.5h 1. Error of estimate of distance is + - 10 2. Error of estimate of speed is + - 5. 选E吧