题目：
The manager of a pension fund determines that during the past five years 85 percent of the stocks in the portfolio have paid a dividend and 40 percent of the stocks have announced a stock split. If 95 percent of the stocks have paid a dividend or announced a stock split, the joint probability of a stock paying a dividend and announcing a stock split is closest to:（）
A. 30%.
B. 45%.
C. 55%.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：操作步骤(1)在画图程序中打开Test8.jpg，将前景色设置为白色，单击“矩形”工具，选择其下方的无边矩形，在图像右上角拖出一个矩形；用同样的方法在白色矩形中绘制出红色无边矩形；单击“直线”工具，...
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