请问老师：“The area between the mean and 39 is 0.14615; and between the mean and 43 is 0.04975. ”这里的两个数是怎么出来的，查表吗？烦请老师解答，谢谢！

老师能把表格给出来吗？表格是怎么查的？

bond value 第三题，计算器显示error5 为什么？解题输入2 N 100 Fv 0 pmt -95.18 pv ,cpt iy就显示error5,哪里不对？

老师 reinvestment risk这个风险是对于投资者的还是债券发行者的？

老师 计算器在算日期的时候如何清零

老师，仓储成本贴现为什么用连续复利而不用一般复利？

为什么interest-only strip的duration为负而principal-only stripduration为正？

请问credit spreads are flat 这个怎么翻译，谢谢

eff is an arbitrage trader, and he wants to calculate the implied dividend yield on a stock while looking at the over-the-counter price of a 5-year put and call (both European-style) on that same stock. He has the following data: *Initial stock price = USD 85 *Strike price = USD 90 *Continuous risk-free rate = 5% *Underlying stock volatility = unknown *Call price = USD 10 *Put price = USD 15 What is the continuous implied dividend yield of that stock? A 7.71% B 5.34% C 4.69% D 2.48% 为什么实在85上折现，不用90

老师 这个解释里说risk appetite就是risk tolerance ，是这样吗？