To calculate average size in the presence of several various sizes can be required in work, study or everyday life. Average sizes are often used for drawing up statistics: it is so possible to learn, for example, average income per capita or the average cost of vegetables in Russia.
It is required to you
- sheet of paper
- handle
Instruction
1. Average in mathematicssize is called "arithmetic average". To calculate an arithmetic average, for a start write out everything the numbers which are available for you on the sheet of paper.
2. This method is often used in educational institutions for exposure of quarter marks. Let's say progress of the pupil Vasya Pugovkin in mathematics was extremely doubtful until the teacher caused in school of his parents. Dad gave to Vasya dressing down, and by the end of a quarter Vasya Pugovkin improved. Let's look on Vasina at estimates: 2 3 3 2 4 4 5 4. What will the teacher deliver to Vasya for a quarter?
3. sum of all numbers divided into quantity of numbers. Put all numbers among themselves. 2+3+3+2+4+4+5+4 = 27.
4. Divide the received number into quantity of Vasiny estimates. 27 to divide into 8 3.375 equals. This number is closer to the three, than to the four. Means, the teacher should deliver to Vasya the three, despite his last progress. However if Vasya Pugovkin receives one more five, assessment will be disputable as 32:9 it is approximately equal to 3.5.