题目

What does blood do for us? It brings food to all parts of our bodies and takes waste away from them. All parts of our bodies are made of cells(细胞). These cells are very small. They all need food all the time. No one had seen cells before the invention of microscope. No one could make pictures of cells because no one could see them. What makes the blood move round the body? The heart does. The heart is a pump. It pumps the blood and sends it round the body. The heart has rooms with doors between them. It pumps blood in and out through these doors by changing the size of the rooms so that th设一次试验成功的概率为p,现进行16次独立重复试验.当p=       时,成功次数的标准差最大,其最大值为           .