以下是引用AegeanSea2006在2005-9-16 17:43:00的发言:2004年9月JJ 257.price change equal to the current day’s closing price minus the last day’s closing price, provide you the price changes for the five working days of a week as follows:v (price change) for Monday, w for Tuesday, x for Wednesday, (-y) for Thursday and z for Friday. Ask you the average price of the week.
解法:m1=v, m2-m1 = w, m3-m2 = x, m4-m3 = -y, m5-m4 = z.
所以(m1+m2+m3+m4+m5)/5 = (5v+4w+3x-2y+z)/5 这道题我有这样的问题:设m1=V对吗,认为周一前一天的closing price=0?感觉有点怪
我怎么觉得应该是(v+w+x-y+z)/5呢??前面那些系数怎么来的??? |