4. (the topic) randomly generated 1000 conforms to the fall of floating point Numbers (average of 5, the standard deviation of 1), and randomly generated from these Numbers and then randomly selected 100 of the 100 digital is four five
, then statistics the number of occurrences of every number after operation, use the * number of different number of occurrences, and according to the digital print since the childhood, statistical program running time, observe the graphical distribution,