离散程度和峰度有关系吗？离散程度越大，峰度越低吗？

自由度和方差之间是什么关系？峰度和方差之间是什么关系？为什么这里的自由度越大，t分布越接近于（0，1）标准正态分布？

22.单选题 已收藏 标记 纠错 Pierre-Louis Robert just purchased a call option on shares of the Michelin Group. A few days ago he wrote a put option on Michelin shares. The call and put options have the same exercise price, expiration date, and number of shares underlying. Considering both positions, Robert’s exposure to the risk of the stock of the Michelin Group is: A long. B short. C neutral. 麻烦讲解下，不懂 谢谢老师

为什么老师说的是互斥不一定独立，ppt上写的是互斥一定不独立。到底是怎么样的呢？互斥不一定独立还是互斥一定不独立？

Which of the following is the least accurate statement about the short sale of stocks? A The short seller must pay all dividends or interest to the lender of shares. B Short sales involve time limits for returning the shares borrowed to the lender. C A short sale can be made only on an uptick or a zero uptick trade if the previous trade was an uptick trade. 这道题要讲下，看不懂

老师这里为何不用考虑FP公式里的分红率呢，q上升，FP应下降呢？

题目没说，同时也能满足gaap就不对呀

题目没说，同时满足gaap就不对呀

You decide to sell short 100 shares of Charlotte Horse Farms when it is selling at its yearly high of 56. Your broker tells you that your margin requirement is 45% and that the commission on the purchase is $155. While you are short the stock, Charlotte pays a $2.50 per share dividend. At the end of one year, you buy 100 shares of Charlotte at 45 to close out your position and are charged a commission of $145. What is your rate of return on the investment? 老师您好，这道题我看解析的时候有个问题，为什么要减去250的红利而不是加哪？

这里为什么说t分布的峰度没有正态分布高，所以t分布离散程度更高？峰度和离散之间是负相关吗？