题目

This Teaching Assistant Level 3 course is designed for people who either are, or wish to become a teaching assistant. Teaching assistants carry out their tasks under the direction of the class teacher. This is a fully supported home study course, and the help is available whenever you need it—either online or over the phone. There is a huge demand for teaching assistants around the country but also many thousands of applicants for these positions. Having this Teaching Assistant Level 3 qualification will help you have an obvious advantage over other applicants. Our Level 3 Teaching As若 的平均数为3，标准差为4，且 ， ，则新数据 的平均数和标准差分别为（ ）A.-9 12B.-9 36C.3 36D.-3 12