Câu 1 : cho các hệ vector U = {(1,2,7);(0,-1,-6,);(2,3,8);(1,0,-5 )}
a. Tìm số chiều và một cơ sở W của không gian con sinh bởi hệ vector U

Will make ! for correct answer the dot plot below shows the number of toys 21 shops sold in an hour.is the median or the mean a better center for this data and why? a. median; because the data is not symmetric and there are outliersb. median; because the data is symmetric and there are no outliersc. mean; because the data is symmetric and there are no outliersd. mean; because the data is skewed and there are outliers