ListPlot[{{0, 6}, {3, 8}, {6, 10}, {7, 13}, {9, 15}, {13, 20}, {17,
22}, {19, 25}, {23, 29}, {27, 32}, {30, 33}}]
ListLinePlot[{{0, 6}, {3, 8}, {6, 10}, {7, 13}, {9, 15}, {13, 20}, {17, 22}, {19, 25}, {23, 29}, {27, 32}, {30, 33}},
InterpolationOrder -> 2, Mesh -> Full]