Here is a data set (n=117n=117) that has been sorted.

52.1	57.3	57.8	57.8	60.9	61.2	61.8	63.3	63.5
63.6	65.1	65.2	65.7	65.8	66	66	66.1	66.2
66.3	66.7	66.7	66.9	67.1	67.2	67.5	67.6	67.7
68	68.1	69	69.1	69.3	69.3	69.4	69.6	70
70.1	70.1	70.2	70.2	70.6	70.8	70.9	71.8	72.1
72.3	72.6	72.7	72.9	73.1	73.2	73.4	73.5	73.5
73.7	73.8	73.8	74.1	74.3	74.3	74.4	74.4	74.5
74.5	74.6	74.6	74.9	75.1	75.7	76	76.2	76.4
76.7	77	77.2	77.6	77.8	77.9	78	78.4	78.6
78.6	78.9	79.4	79.4	79.5	79.6	79.9	79.9	79.9
80.5	81	81	81.2	81.4	81.6	81.9	81.9	82.6
82.8	83	83	83.6	84	85	85.3	85.8	86.1
87.4	87.5	87.6	88.9	89.8	90.7	95.6	95.7	96

Find the 77th-Percentile: P₇₇ =