Pace Work. Math

Дата: 04.05.2020

Тема уроку: Середнє арифметичне

Зміст уроку: Поняття "середнє арифметичне". Розв'язування прикладів і задач

1. Study the theory block

What Is the Arithmetic Mean?

The arithmetic mean is the simplest and most widely used measure of a mean, or average. It simply involves taking the sum of a group of numbers, then dividing that sum by the count of the numbers used in the series.
For example, take 34, 44, 56 and 78. The sum is 212. The arithmetic mean is 212 divided by four, or 53.

How the Arithmetic Mean Works

The arithmetic mean maintains its place in finance, as well. For example, mean earnings estimates typically are an arithmetic mean. Say you want to know the average earnings expectation of the 16 analysts covering a particular stock. Simply add up all the estimates and divide by 16 to get the arithmetic mean.
The same is true if you want to calculate a stock’s average closing price during a particular month. Say there are 23 trading days in the month. Simply take all the prices, add them, up and divide by 23 to get the arithmetic mean.
The arithmetic mean is simple, and most people with even a little bit of finance and math skill can calculate it. It’s also a useful measure of central tendency, as it tends to provide useful results, even with large groupings of numbers.
2. Do the task: 
- Find the arithmetic mean of first five prime numbers.
- Find the average of 56, 41, 59, 52, 42 and 44.
- The average salary of 20 officers in a company is 300. The average salary of non-officers in the same company is 120. Find the number of the non-officers if the average of the whole organization is 150.

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