please help asap

thank you,

Knowledge: 1. Which is a correct statement regarding a weighted mean? A The weighted mean is less affected by outliers than the median. B Multiply the weighting by the corresponding data value, then find the sum of the products. C A weighted mean is always different from the actual mean. D A weighted mean accounts for the relative importance of each value in the average. 2. A student said to her friend, "Most of the class got marks in the 80s in math." Which measure of central tendency is she using? A median C mean B mode D mean for grouped data 3. Which measure of central tendency must be a value in the data? A mean C mode B median D All of the above