The median is 0. Look at the data in this way sorted, the middle number is 0. There are 288 items and the 144th and 145th item are 0.
pr <- c(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 40, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 19, 67, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 27, 0, 0, 0, 0, 0,
0, 36, 50, 38, 0, 4, 42, 14, 8, 135, 172, 124, 31, 52, 0, 104, 170, 58, 0, 0, 75, 0, 0, 211, 321, 149, 0, 82, 94, 225, 216, 199, 50, 187, 30, 0, 65,
173, 43, 0, 0, 0, 0, 0, 0, 0, 16, 26, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 95, 64, 7, 33, 72, 221, 439, 519, 440,
394, 97, 71, 10, 87, 443, 500, 465, 485, 351, 515, 511, 506, 486, 171, 12, 24, 42, 140, 15, 0, 43, 67, 48, 0, 0, 9, 31, 30, 64, 115, 25, 0, 27, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 27, 27, 0, 0, 9, 0, 0, 54, 35, 0, 49, 0, 0, 0, 0, 93, 0, 0, 13, 0, 6, 12, 0, 0, 34, 77, 173, 370, 402, 504,
485, 437, 526, 264, 0, 35, 124, 93, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 33, 118, 0, 6, 0, 262, 33, 46, 35, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
length(pr)
#> [1] 288
sort(pr)
#> [1] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
#> [19] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
#> [37] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
#> [55] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
#> [73] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
#> [91] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
#> [109] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
#> [127] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
#> [145] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
#> [163] 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
#> [181] 0 0 4 6 6 7 8 9 9 10 11 12 12 13 14 15 16 19
#> [199] 24 25 26 27 27 27 27 30 30 31 31 33 33 33 34 35 35 35
#> [217] 36 38 40 42 42 43 43 46 48 49 50 50 52 54 58 64 64 65
#> [235] 67 67 71 72 75 77 82 87 93 93 94 95 97 104 115 118 124 124
#> [253] 135 140 149 170 171 172 173 173 187 199 211 216 221 225 262 264 321 351
#> [271] 370 394 402 437 439 440 443 465 485 485 486 500 504 506 511 515 519 526
median(pr)
#> [1] 0
Created on 2021-08-03 by the reprex package (v2.0.0)