亲们，帮帮忙，大学数学帮帮忙题 ，急啊

来源：蜘蛛抓取(WebSpider) 时间：2016-05-31 00:52 标签： 数学帮帮忙
大学数学题,求教啊&
记住公式：(A*)* = (|A|^(n-2)) · A (n>2) n为矩阵阶数
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秒以后自动返回大学数学题 求大神帮忙 越快越好1.This exercise uses the normal probability density function and requires the use of either technology or a table of values of the standard normal distribution. Repeated measurements of a student's IQ yield a mean of 115, with a standard deviation of 10. What is the probability that the student has an IQ between 113 and 117? (Round your answer to four decimal places.) 2.This exercise uses the normal probability density function and requires the use of either technology or a table of values of the standard normal distribution. The cash operating expenses of the regional phone companies during the first half of 1994 were distributed about a mean of $29.87 per access line per month, with a standard deviation of $2.95. Company A's operating expenses were $28.00 per access line per month. Assuming a normal distribution of operating expenses, estimate the percentage of regional phone companies whose operating expenses were closer to the mean than the operating expenses of Company A were to the mean. (Round your answer to two decimal places.) 3.Assuming that workers' salaries in your company are uniformly distributed between $20,000 and $70,000 per year, calculate the average salary in your company.麻烦写下步骤
第3题，题里说工资均匀分布在[20k,70k]，计算平均工资=()/2=45000 前两个题英语太长了！
谢谢啊 其实我有大概过程 只是里面有一些不懂 能不能私聊帮我看看 感谢
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秒以后自动返回大学数学题，帮帮忙咯╮(╯▽╰)╭_百度知道
大学数学题，帮帮忙咯╮(╯▽╰)╭
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x=0时;1、x=1，你自己算=(1-x)/x*求和（x^n&#47。
S(x)=求和（x^n/∞)[n&#47，S(x)=【1/n*(n+1)】的无穷和=【1&#47，S(x)收敛？令S(x)=那玩意当|x|=&(n+1)）
=代入泰勒公式ln(1-x)泰勒公式;x * ln(1-x)+1
%你最好验算下^_^、|x|&n+1]=12;n）- 1/1时;n-1/(n+1)）=求和（x^n&#47，且≠0时;n）-求和（x^n&#47，S(x)=0.3;(n+1)】无穷和=lim(n-&gt。1!（竟然收敛于1
通向化为两项之差，前者求和的导函数为等比序列求和，后者的x倍的导函数为等比序列求和
答案不是这个
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