Steps for frequency polygon: (d) Class intervals (c) Histogram (a) Mid-points (b) Join mid-points

(d),(c),(a),(b)

Values 9,12,6,12,11: Mean=10, Median=11, Mode=12, 2×Mean-3×Mode=-16. Ascending order

(c),(b),(d),(a)

Match graphs: Histogram-Continuous data, Bar-Comparison, Pie-Part to whole, Frequency Polygon-Joining mid-points

a-III,b-IV,c-II,d-I