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  3. [img]ct_4image006[/img]A square dart board has four dark circular regions of ra

[img]ct_4image006[/img]A square dart board has four dark circular regions of ra

游客2024-01-12  83
问题
A square dart board has four dark circular regions of radius 3 inches, as shown in the design above. Each point on the dart board is equally likely to be hit by a dart that hits the board. What is the probability that a dart that hits the board will hit one of the circular regions?
选项 A、п/16
B、п/48
C、п/64
D、1/3
E、1/4
答案 A
解析 如上面的图样所示，1个正方形的标枪板上有4个半径为3英寸的圆形的黑色区域。标枪击中标枪板上的每个点的概率相同，击中标枪板的标枪击中4个圆形区域中的某一个的概率是多大?
解：本题的正确答案是(A)。该题其实是问4个圆形区域的面积占标枪板的总面积的几分之几，这个分数就是击中标枪板的标枪击中4个圆形区域中的某一个的概率.
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