For one toss of a certain coin, the probability that the outcome is heads is 0.6. If this coin is tossed 5 times, which of the following is the probability that the outcome will be heads at least 4 times?
~$0.6^{5}$~
~$2\left ( 0.6 \right )^{4}$~
~$3\left ( 0.6 \right )^{4}\left ( 0.4 \right )$~
~$4\left ( 0.6 \right )^{4}\left ( 0.4 \right )+\left ( 0.6 \right )^{5}$~
~$5\left ( 0.6 \right )^{4}\left ( 0.4 \right )+\left ( 0.6 \right )^{5}$~
这道题是有顺序的,要乘以a54,
是C54吧
登录 或 注册 后可以参加讨论