# Advice 1: How to find the average density

Most of the bodies has a complex structure, because they consist of different substances. Therefore, to find their density using tables is almost impossible. To get an idea about their structure, use such a thing as an average density, which is calculated after measuring the mass and volume of the body.
You will need
• - scales;
• - measuring cylinder;
• - table of densities of various substances.
Instruction
1
If the body does not consist of the same stuff, find it with weights its weight, and then measure the volume. If it is fluid, perform measurement using the measuring cylinder. If it is a solid (cube, prism, polyhedron, sphere, cylinder, etc.), find its volume by geometric methods. If the body is irregular in shape, submerge it in the water, which poured into the measuring cylinder, and its ascent will determine body volume. Divide the measured mass of a body on its volume, the result is the average density of the body ρ=m/V. If the mass is measured in kilograms, volume in m3 Express, if in grams in cm3. Accordingly, the density is obtained in kg/m3 or g/ cm3.
2
If you weigh the body is not possible, find out the density of the materials of which it is composed, then measure the volume of each part of the body. Then find the mass of materials which compose the body, multiplying their density on the volume and the total volume of the body, adding the volumes of its constituent parts, including voids. Divide the total mass of a body on its volume and get the average density of the body ρ= (ρ1•V1+ ρ2•V2+...)/(V1+V2+...).
3
If the body can be immersed in water, find its weight in water with the help of dynamometer. Determine the amount of ejected water, which is equal to the volume submerged in her body. In the calculations, keep in mind that the density of water is 1000 kg/m3. To find the average density of the body immersed in water, to its weight in Newtons, add the product of the number 1000 (density of water) on the acceleration of gravity 9.81 m/S2 and the body volume in m3. The number you divide by the product of the volume of the body and of 9.81 ρ=(R+ RV•V•9,81)/(9,81• V).
4
When a body floats in water, find the volume of the ejected fluid, the volume of the body. Then, the average density of a body is equal to the ratio of the product of density of water on her body ejected the volume and of the volume of the body ρ= RV•V/Vт.

# Advice 2: How to determine the average number

The average number of employees average number of employees for a certain period of time. Report on this indicator pass all of the organization to the tax office annually by January 20 for the previous year in the creation (liquidation) of the enterprise before the 20th day of the following month.
You will need
• The time sheet
Instruction
1
The report dealt form CPV-1110018 "Information on the average number of employees for the preceding calendar year. The average number of employees of the organization are very important in the delivery of the following tax forms: VAT, profit tax, property tax, land tax and when it has a right to transfer to the simplified taxation system.
2
First, determine the figure for each day. It takes into account all actually working and not working, missing for any reason. Persons who did not work full time, are considered to be proportional to the amount of time worked.
3
Then fold the number of employed workers for the entire month and divide by the number of calendar days in that month.
4
Further, summarize the average figure for each month and divide by the number 12 (number of months in a year). The resulting figure will be – the average number of employees during the calendar year.
5
The average number of workers included even those who work under a contract of employment and seasonal workers. Employees who for valid reasons, the reduced duration of working time are considered as whole units. Employees working under a contract of employment, but ranking in another organization can't log in the average reported number of employees. The number of employees should be displayed in the timesheet form number T-12 or T-13.

# Advice 3: How to find the geometric mean

The average geometric in General is used less frequently than the arithmetic mean, but it can be useful when calculating the average value of indicators changes over time (wages of an individual employee, the dynamics of indicators of progress, etc.).
You will need
• Scientific calculator
Instruction
1
In order to find the geometric mean of several numbers, first you need to multiply all these numbers. For example, you are given a set of five indicators: 12, 3, 6, 9 and 4. Multiply all these numbers: 12х3х6х9х4=7776.
2
Now from the resulting numbers need to extract the root degree equal to the number of elements of the series. In our case, the number 7776 will need to extract the fifth root using the scientific calculator. Obtained after this operation the number – in this case 6 – will be the geometric average for source group number.
3
If you don't have the scientific calculator, then calculate the geometric mean of series of numbers by using functions SRGEON in Excel or by using one of the online calculators specifically designed to compute geometric means.
Note
If you need to find the geometric mean of the total for the two numbers, the calculator you do not need to remove the root of the second degree (square root) of any number you can use the regular calculator.