数学家 进来看看！！！！！

卧室春竹

先声明一下 不是gmat的题目....

是我入学考试的题目... 请大家帮帮忙！！！ 几个概率论的题目！！

谢谢！

1 A coin tossed repeatedly. Find the probility distribution of the " run lengths" i.e. the unmber of consecutive heads or tails. In a very long series of tosses, suppose there are N runs of which fx are of length x (e.g. HTTHHHT has N=4, f1=2 f2=1 f3=1) Show that a graph of log fx against x should give an approximate straight line with slope- log2.

呵呵 我觉得不知道N 没法算阿

2 Define the expectation of a function f(X) of a discrete random variable X.
这句话的具体意思我不太清楚.... 是问随机变量函数得期望？？

3 还有英文得 normal distribution 中文是哪种概率分布？？？

请数学家帮忙 呵呵

顺便祝大家 身体健康....

tongxun

只知道2就是你说的东西，其他的不明白。那位高手帮忙解释一下？

卧室春竹

1 A coin tossed repeatedly. Find the probility distribution of the " run lengths" i.e. the unmber of consecutive heads or tails. In a very long series of tosses, suppose there are N runs of which fx are of length x (e.g. HTTHHHT has N=4, f1=2 f2=1 f3=1) Show that a graph of log fx against x should give an approximate straight line with slope- log2.

f1=2就是由2个单个 比如第一个H和最后一个T 都是单个的
f2=1就是有一个2各连续的TT
f3=1有一个3各连续的HHH

SLOP-LOG2是不是就是2维的坐标？

高人在帮忙想想！

卧室春竹

感觉像正态分布阿？

呵呵