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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(biāo)準(zhǔn)偏差有助于估計(jì)風(fēng)險(xiǎn) 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(gè)值 之間可以得到一個(gè)累積的概率值