A sample of 26 offshore oil workers took part in a simulated escape exercise, resulting in the accompanying data on time (sec) to complete the escape:
384 351 356 361 378 420 320 395 403
373 375 372 362 368 364 325 336 393
391 368 378 358 353 406 331 398
Sample median is 370.
By how much could the value 420 be decreased without affecting the value of the sample median? (Enter infinite if there is no limit to the amount.)