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magico · 2018年12月24日

问一道题:NO.PZ2017092702000049

问题如下图:

    

选项:

A.

B.

C.

解释:


这道题目是否可以估算?因为fourth quintile ,也就是大致在8与9这两个数字之间,因此从后往前看收益率,找到是介于20.65和27.37.因此只有一个B答案

1 个答案

菲菲_品职助教 · 2018年12月26日

同学你好,在做选择题的时候,当然可以采取这种方法进行估算,这道题目比较好,通过估算直接就可以选出答案,但是不排除会有通过估算发现两个选项都在估算范围内这种情况,所以还是要掌握具体的计算方法,对于不同的题目采取不同的应对措施哦~

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老师 forth quintile不就是第四个五分位数吗?就是十个数里第八个啊?

2020-10-31 20:32 1 · 回答

这题的fourth quintile不是五分之四吗?不就是十分之八的第八个数吗?我好像忘记知识点了

2020-10-28 15:22 1 · 回答

26.03%. 27.37%. B is correct. Quintiles vi a stribution into fifths, with the fourth quintile occurring the point whi80% of the observations lie below it. The fourth quintile is equivalent to the 80th percentile. To finthe yth percentile (Py), we first must termine its location. The formula for the location (Ly) of a yth percentile in arrwith n entries sortein ascenng orr is Ly = (n + 1) × (y/100). In this case, n = 10 any = 80%, so L80 = (10 + 1) × (80/100) = 11 × 0.8 = 8.8. With the ta arrangein ascenng orr (-40.33%, -5.02%, 9.57%, 10.02%, 12.34%, 15.25%, 16.54%, 20.65%, 27.37%, an30.79%), the 8.8th position woulbetween the 8th an9th entries, 20.65% an27.37%, respectively. Using lineinterpolation, P80 = X8 + (Ly – 8) × (X9 – X8), P80 = 20.65 + (8.8 – 8) × (27.37 – 20.65) = 20.65 + (0.8 × 6.72) = 20.65 + 5.38 = 26.03%老师能不能一下插值法,也就是8·8位置的数为什么是0·8乘以两数相减

2020-07-06 20:43 1 · 回答

26.03%. 27.37%. B is correct. Quintiles vi a stribution into fifths, with the fourth quintile occurring the point whi80% of the observations lie below it. The fourth quintile is equivalent to the 80th percentile. To finthe yth percentile (Py), we first must termine its location. The formula for the location (Ly) of a yth percentile in arrwith n entries sortein ascenng orr is Ly = (n + 1) × (y/100). In this case, n = 10 any = 80%, so L80 = (10 + 1) × (80/100) = 11 × 0.8 = 8.8. With the ta arrangein ascenng orr (-40.33%, -5.02%, 9.57%, 10.02%, 12.34%, 15.25%, 16.54%, 20.65%, 27.37%, an30.79%), the 8.8th position woulbetween the 8th an9th entries, 20.65% an27.37%, respectively. Using lineinterpolation, P80 = X8 + (Ly – 8) × (X9 – X8), P80 = 20.65 + (8.8 – 8) × (27.37 – 20.65) = 20.65 + (0.8 × 6.72) = 20.65 + 5.38 = 26.03% ​就算按照偶数算,第八位数也是20.65A呀

2020-02-05 16:58 2 · 回答

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2019-11-26 15:20 1 · 回答