老师你好，原版书512页第5题，读不懂题目啊， Forty percent of the companies to which the test is administered will go bankrupt within 12 months: P(nonsurvivor) = 0.40. Fifty-five percent of the companies to which the test is administered pass it: P(pass test) = 0.55. 第一句话是说测试出来有40%的公司会在接下来的12个月内破产； 第二句话是说有55%的公司被测试出通过了这个标准， 既然这两个事件都是测试出来的结果，那么为什么这两个事件的概率之和不等于1呢？

老师，这里为什么是50亿乘以20%，不是50亿乘以50%吗

07.单选题 已收藏 标记 纠错 The household sector has increased the fraction of disposable income that it saves because real estate values declines sharply. Which of the following is most(correct response supposing that output and investment spending remain unchanged? A A decrease in net exports and increased capital inflow. B An increase in net exports and increased capital outflow. C A decrease in the government deficit. 查看解析 上一题 提交试卷 正确答案B 您的答案A本题平均正确率：58% GDP calculation难度：一般 推荐：      答案解析 问：这道题我懂怎么做，我的问题是：假设output and investment这里的output有什么含义，好多题里都出现这个词，具体怎么解释，不好直接忽略吧？

第一个式子还是不太明白？第一个式子等式左边是什么意思呀？

没有明白折现率是什么意思？这个公式也不懂，这个公式中的CF是什么意思呢？

02.单选题 已收藏 标记 纠错 Equality between aggregate expenditure and aggregate output implies that the government‘s fiscal deficit must equal: A Private saving - Investment - Net exports. B Private saving - Investment + Net exports. C Investment - Private saving + Net exports. 查看解析 上一题 下一题 正确答案A 您的答案A本题平均正确率：51% GDP calculation难度：一般 推荐：      答案解析 The fundamental relationship among saving, investment, the fiscal balance, and the trade balance is S = I (G - T) (X - M). This form of the relationship shows that private saving must fund investment expenditures, the government fiscal balance, and net exports (= net capital outflows). Rearranging gives G - T = (S -I) - (X - M). The government's fiscal deficit (G - I) must be equal to the private sector's saving/investment balance (S -I) minus net exports. 问：如图，紫色箭头标明的 1.aggregate output就是总收入 output为啥对应income？2.fiscal deficit是 G-T,G-T应该是盈余或者赤子吧，感觉表达的也不严谨？

你好麻烦讲解一下21题

01.单选题 已收藏 标记 纠错 In 2013, a calligraphyis produced and sold for $3,000. The expenses involved in producing the painting amounted to $1,000. What is the value added by the final step of creating the painting based on the sum-of-value-added method of calculating GDP: A $2000. B $3000. C $5000. 查看解析 下一题 正确答案A 您的答案A本题平均正确率：77% GDP calculation难度：一般 推荐：      答案解析 This is the value added by the artist: $3,000 — $1,000 = $2,000. 问：这个是基础课里的截图：她的意思是 第一个0.15也要算进来，对应这道题就是第一个1000块钱也应该算进来吗？ 是否有矛盾？

这道题算出PA乘以PB不等于八分之三 是不独立事件 答案不应该选B吗 怎么是A

老师这道题 算出PA乘以PB不等于八分之三 所以他们两个是不独立事件不应该选B吗