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x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x 正態(tài)曲線和概率 ?了解了正態(tài)曲線的平均值和標準偏差有助于估計風險 Probability of sample value 4 3 2 1 0 1 2 3 4 40% 30% 20% 10% 0% Zaxis (scale in units of ‘s’) Number of standard deviations from the mean % % % 在兩個值 之間可以得到一個累積的概率值