新东方讲义11题DS的，THS了

Nicolexin

At the beginning of a five-day trading week, the price of a certain stock was $10 per share.During the week, four out of five closing prices of the stock exceeds $10.Did the average closing price of the stock during the week exceed its price at the beginning of the week?
(1)The stock's closing price on Tuesday was the same as its closing price on Thursday.
(2)The sum of the stocke's highest and lowest closing prices during the week was 20

sdcar2010

begining: 10, a, b, c, d
closing:     a, b, c, d, e (4 of them >10)

1) Insufficient: 0, 10, 100,10,10.  0, 10.1, 10.1, 10.1, 10.1
2) Sufficient. Because if the highest and lowest closing prices during the week was 20, each of the other three days' closing price is bigger than $10.