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Gaokao Math Practice Question

某群体中的每位成员使用移动支付的概率都为 $\mathrm{p}$, 各成员的支付方式 相互独立. 设 $X$ 为该群体的 10 位成员中使用移动支付的人数, $D X=2.4, P$ $(x=4)<p(x=6)$, 则 $p=(\qquad)$

  1. A.0.7
  2. B.0.6
  3. C.0.4
  4. D.0.3

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