I hope the below Explanation helps you.If so,Mark it as a Brainliest Answer. Step-by-step explanation:a.Mean=Sum of Observations/No.of Observations =(3+7+8+5+6+9+6+4+6)/9 =54/9=6 Mode=Most Repeated NUMBER=6 ASCENDING Order:3,4,5,6,6,6,7,8,9. Median=Middle Most number when arranged in ascending order=6 Ascending Order:3,4,5,6,6,6,7,8,9.b.Mean=Sum of Observations/No.of Observations =(25+30+26+28+33+25+26+27)/8 =220/8=27.5 Mode=Most Repeated Number=25,26 Ascending Order:25,25,26,26,27,28,30,33 Since there are even no.of Observations AVERAGE of two middle values is Median. Median = (26+27)/2=26.5c.Mean=Sum of Observations/No.of Observations =(3+4+1+5+6+4+2+4)/8 =29/8=3.625 Mode=Most Repeated Number=4 Ascending Order:1,2,3,4,4,4,5,6 Since there are even no.of Observations Average of two middle values is Median. Median = (4+4)/2=4d.Mean=Sum of Observations/No.of Observations =(20+30+40+40+10+16+40+30)/8 =226/8=28.25 Mode=Most Repeated Number=40 Ascending Order:10,16,20,30,30,40,40,40. Since there are even no.of Observations Average of two middle values is Median. Median = (30+30)/2=30