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粗眉毛辣椒油 · 2024年01月14日

这道题除了有超出给定表的数据,还有无法精准得出的,比如1.5,在表单中只有接近1.5的数据,这种情况怎么计算?

NO.PZ2020010303000009

问题如下:

Either using a Z table or the Excel function NORM.S.DIST, compute

a. Pr(-1.5 < Z < 0), where Z ∼ N(0, 1)

b. Pr(Z < -1.5), where Z ∼ N(0, 1)

c. Pr(-1.5 < X < 0), where X ∼ N(1, 2)

d. Pr(X > 2), where X ∼ N(1, 2)

e. Pr(W > 12), where W ∼ N(3, 9)

选项:

解释:

a. 43.3%. In Excel, the command to compute this value is NORM.S.DIST(0,TRUE) – NORM.S.DIST(-1.5,TRUE).

b. 6.7%. In Excel, the command to compute this value is NORM.S.DIST(-1.5,TRUE).

c. 20.1%. In Excel, the command to compute this value is NORM.S.DIST((0 – 1)/SQRT(2),TRUE) – NORM.S.DIST((-1.5-1)/SQRT(2),TRUE).

d. 24.0%. In Excel, the command to compute this value is 1 – NORM.S.DIST((2 – 1)/SQRT(2),TRUE).

e. 0.13%. In Excel, the command to compute this value is 1 – NORM.S.DIST((12 – 3)/3,TRUE).

这道题除了有超出给定表的数据,还有无法精准得出的,比如1.5,在表单中只有接近1.5的数据,这种情况怎么计算?

2 个答案

李坏_品职助教 · 2024年01月17日

嗨,爱思考的PZer你好:


考试的时候不存在超出表格数据的情况,FRM出题还是很靠谱的。

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虽然现在很辛苦,但努力过的感觉真的很好,加油!

李坏_品职助教 · 2024年01月15日

嗨,从没放弃的小努力你好:


如果考试中没有完全精确的1.5对应的概率值,那就选最接近1.5的。

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加油吧,让我们一起遇见更好的自己!

粗眉毛辣椒油 · 2024年01月16日

如果是超出给定表的数据,怎么计算呢?

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