Xiaoming counted 125 coins in his piggy bank, of which 44% were one-dollar coins, 20% were quarters, and 36% were quarters.

72 yuan is in the piggy bank. One yuan: 125×44%× 1=55 yuan, five yuan: 125×20%×0.5= 12.5 yuan, one corner:125× 36 %× 0.6544. In the statistical process, knowing the number of coins and the proportion of coins of each value can calculate the number of coins of each value. The formula is: total number of coins × coin ratio = number of coins with a specific face value. Multiply the amount by the face value to get the amount of money, and the face value always adds up to complete the statistics.

1, the word statistics comes from the national survey, and its original meaning is national science. Generally speaking, statistics includes three meanings: statistical work, statistical data and statistical science. The relationship between statistical work, statistical data and statistical science is that the result of statistical work is statistical data, and the basis of statistical data and statistical science is statistical work. Statistical science is not only a theoretical summary of statistical work experience, but also a principle, principle and method to guide statistical work.

2. Metal coins have the advantages of convenient use, wear resistance and long circulation life. In addition to its own monetary function, it also has a high artistic appreciation and value preservation function. Coins issued by New China can be roughly divided into ordinary coins; Metal commemorative coins for circulation and precious metal commemorative coins for collection. Among them, precious metal commemorative coins, commonly known as gold and silver coins, are expensive and have a small circulation. Due to political, economic and foreign exchange earning considerations, the state is now focusing on developing the international market in sales, and at the same time, it has begun to cultivate, base itself on the domestic market and promote it on a large scale throughout the country.

3. There are six denominations of RMB coins: 1, 2, 5, 1, 5, 1 yuan. It has been 69 years since People's Republic of China (PRC) issued RMB. With the development of economic construction and the needs of people's lives, it will be gradually improved and improved. So far, five sets of RMB have been issued, forming a multi-variety and multi-series monetary system, such as paper money and metal coins, ordinary commemorative coins and precious metal commemorative coins. The notes in circulation are: 1, 5 cents, 1, 5 10/0,2050100 yuan. Coins are 1, 5 and 1 yuan.