below. A survey about the family size in one region was done. The frequency table is listed Family size Frequency relative Frequency 2 3 4 6 0.2 4 0.25 5 3 0.15 6 1.(2) Fill the blanks in the above table. 2.(4) Calculate the sample mean, and sample variance for this survey data. 3.(4) Calculate first quartile, median, and the third quartile for this survey data.