6．下列对本文理解和分析，不正确的一项是(3分)

A．文中的“仁人”主要是指那些对他人怀有仁爱之心、实施仁政的人。

B．文章借士君子的质疑展开论说，阐述了“兼爱”的可行性，说理严密具有说服力。

C．“兼爱”的好处远大于迎合君主所得到的好处。士君子没有认识到这一点，这是识小利而不识大利。

D．文章举事例进行论证，夹叙夹议，说理深入浅出。

5．下面句子中加点词的意义和用法，不相同的一组是(3分)

A．仁人之所以为事者　　　　　　　　　 强秦之所以不敢加兵于赵者

B．以相爱生也　　　　　　　　　　　　 洎牧以谗诛

C．昔者晋文公好士之恶衣　　　　　　　 王无异于百姓之以王为爱也

D．忠实欲天下之富而恶其贫　　　　　　 夫赵强而燕弱，而君幸于赵王

8. The random variable X has the following probability distribution:

a.If the mean of X is -0.5, then find the a and b.

b. If the mean of X is 2.2, then find the a and b.

7.The random variable X, has the following probability distribution,

where 0 < p < 0.5

a.Find the mean of X .

b.Find the standard deviation of X

c. If the median of X is 0, then find the value of 　p.

6. For a random variable X, E(X) = 2 and sd(X) = 3.Find E(X²) .

5. For a random variable X, E(X) = 5 and E(X²) = 34. Find the standard deviation of X .

4. Suppose that a random variable X is such that E(X) = 3.2 and Var(X) = 1.8. Suppose further that Y is a random variable such that Y = 2X + 3.Find E(Y) and Var(Y) .

3. Suppose that the random variable X has the probability distribution given in the following table:

a.Find 　.

b. For this probability distribution,find the mode of X.

c. For this probability distribution ,find the median of X.

d. For this probability distribution,find the expected value E(X) .

e. For this probability distribution find the variance Var(X).