mttttttthhhhhhh6147 mttttttthhhhhhh6147 12-09-2022 Mathematics contestada The mean length of Beethoven's nine symphonies is 37 minutes; the standard deviation is 12 minutes. 27 min, 30 min, 47 min, 35 min, 30 min, 40min, 35min}, 22min, 65 min