작업위생측정 및 평가산업위생관리기사 · 2022년04월24일 · 32/100
32.화학공장의 작업장 내에 Toluene 농도를 측정하였더니 5, 6, 5, 6, 6, 6, 4, 8, 9, 20ppm일 때, 측정치의 기하표준편차(GSD)는?
1
1.6정답
2
3.2
3
4.8
4
6.4
해설
log(GM) = (5+6+5+6+6+6+4+8+9+20)/10 = 0.83 log(GSD) = 루트[{(log5-0.83)^2 + (log6-0.83)^2 + (log5-0.83)^2 + (log6-0.83)^2 + (log6-0.83)^2 + (log6-0.83)^2 + (log4-0.83)^2 + (log8-0.83)^2 + (log9-0.83)^2 + (log20-0.83)^2} / {10-1}] = ??? 10^??? = 1.6