名校
解题方法
1 . 切比雪夫不等式是19世纪俄国数学家切比雪夫(1821.5~1894.12)在研究统计规律时发现的,其内容是:对于任一随机变量
,若其数学期望
和方差
均存在,则对任意正实数
,有
.根据该不等式可以对事件
的概率作出估计.在数字通信中,信号是由数字“0”和“1”组成的序列,现连续发射信号
次,每次发射信号“0”和“1”是等可能的.记发射信号“1”的次数为随机变量
,为了至少有
的把握使发射信号“1”的频率在区间
内,估计信号发射次数
的值至少为______ .
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