题目内容
某投资者目前持有的金融资产市值共计70万元，其中债券价值30万元，年化收益率为6%;股票投资价值40元，年化收益率为10%，则该投资者的复合收益率为()。
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投资者王先生投资了某种面值为1000元的附息债券，票面利率为6%，每年付息一次，期限为5年，若已知市场上必要收益率为7%，则该债券的价格应为()元。
如果何先生决定在孩子上大学当年就准备好所有教育费用，如果采用定期定投的方式，则每月初应投入的资金为()元。
A．to the endB．at an endC．as a resultD．with the result
The difference between biological and physical science is not that one is inexact, the other exact, but in degree of exactness, this being related to the number of variables which must be dealt with simultaneously and the extent to which they can be controlled. In general, the biological sciences must deal with larger errors than the physical sciences; but this is not uniformly true, as the student will realize when he considers the accuracy of meteorological prediction or if he comprehends the meaning of the fact that the structural engineer considers it necessary very often to use a safety factor of two or three hundred per cent. The statistical principles of dealing with error of measurement, or in prediction and generalization, are the same whether the errors are large or small. Statistics is not a means of confusing issues that would otherwise be clear, nor a substitute for obtaining clear answers, but a means of checking and controlling conclusions by providing an estimate of the error to which a conclusion is subject.
What do statistics do for science？
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