45 decibels (meausurement of sound)
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"Permitted Exposure Time Guidelines - SPL"Sound pressure level Lp and permissible exposure time t:115 dB = 0.46875 minutes (~30 sec)112 dB = 0.9375 minutes (~1 min)109 dB = 1.875 minutes (< 2 min)106 dB = 3.75 minutes (< 4 min)103 dB = 7.5 minutes100 dB = 15 minutes97 dB = 30 minutes94 dB = 1 hour91 dB = 2 hours88 dB = 4 hours85 dB = 8 hours82 dB = 16 hoursLower dBs are said to be harmless
mean = 270 divided by 5 = 54 median = 45 mode = 45
If you mean .75 of an hour then it is 45 minutes
Time is usally expressed in hours, minutes, or seconds. "Permitted Noise Exposure Time Guidelines - SPL" Sound pressure level Lp and permissible exposure time t: 115 dB = 0.46875 minutes (~30 sec) 112 dB = 0.9375 minutes (~1 min) 109 dB = 1.875 minutes (< 2 min) 106 dB = 3.75 minutes (< 4 min) 103 dB = 7.5 minutes 100 dB = 15 minutes 97 dB = 30 minutes 94 dB = 1 hour 91 dB = 2 hours 88 dB = 4 hours 85 dB = 8 hours 82 dB = 16 hours Lower dBs are said to be harmless
45