A population distribution is normal with a mean of 18 and standard deviation of 4. A sample of 16 observations is selected and a sample mean computed. What is the probability that the sample mean is more than 18?
【简答题】以下程序设计功能是:将结构体变量time 中的内容写到文件中。 include <iostream> using namespace std; struct date { int year; int month; int day; } int main ( ) { date time = { 2005, 1, 1 }; ofstream outdate; outdate.open( 'd://da...