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列位高人，在下近来做了几套面试模拟题，遇到一些不会的。列在了下面。希望如果有达人愿意帮助的话请把详细过程指导一下。万分感激！！！！

1.  Describe the method by which you would determine the relationship between the length of a spring and the stress under which it is under. Include details of how you would compute the precise relationship. What would you do as the spring approaches catastrophic failure?
请问这个是否该回答：P = dgh (d 位液体密度，g是重力加速度，常数，h就是那个井下深度)？那接下来的问题如何回答呢？

2. A stock has beta of 2.0 and stock specific daily volatility of 0.02. Suppose that yesterday's closing price was 100 and today the market goes up by 1%. What's the probability of today's closing price being at least 103?
彻底没概念啊。。。望达人指教


3. When cycling home at night, I notice that sometimes my rear light is switched off when I arrived home. Presumably the switch is loosse and can flip from on to off or back again when I go over bumps. I suppose that the number n of flippings per trip has a Poisson distribution e^(-lam)*lam^n/n!. If the probability that the light is still on when I arrive home is p, find lam.
望达人指教。。。

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关键词：relationship distribution Catastrophic Probability APPROACHES determine between details failure spring

1.后边一问应该是一个开放性问题，我认为应该围绕着压力与动力之间的关系来回答，说白了就是要表现出自己的抗压能力。
2.
3.事件发生的偶数次之和，本来想做出个结果的，结果。。。。。暑假刚结束，你懂的。
  不一定正确，共同讨论。

3. lam = - 0.5 ln ( 2 p  - 1 )

Enthuse 发表于 2012-2-14 05:54
3. lam = - 0.5 ln ( 2 p  - 1 )

可否提供详细的解答过程呢？谢谢。

markeling 发表于 2012-2-13 17:16
1.后边一问应该是一个开放性问题，我认为应该围绕着压力与动力之间的关系来回答，说白了就是要表现出自己的 ...

第二题可否提供详细解答过程呢？谢谢啊！

楼下的回答

smallfat406 发表于 2012-2-14 11:23
楼下的回答

？？