Is the median secondary or elementary?

For example, 1 2 3 4 5 3 3 is the median, and 1 2 3 4 is the median.

There may be different versions of math textbooks across the country, so the progress varies from place to place.

Around the fifth grade of elementary school.

Median: Arrange the data from smallest to largest, taking the middle one. If there are 2 that add up and divide by 2, it means medium.

Average: The sum of all data in a set of data divided by the number of data. It is a metric that reflects trends in a data set.

Indicates the average.

If the data is quite different, the median is appropriate, and the average is not too different. Let's put it this way: when the size of the data is about the same, take the average; When there is a significant difference in the size of the data, and the number of data is small, the mode is taken. When there is a significant difference in the size of the data, and the number of data is large, the median is taken.

Do you understand?

The Beijing Normal University version of the textbook was learned in the fifth grade.

Put a column of numbers in order, and the middle number is called the median of the column.

Elementary school, we went to the fifth grade.

You should learn everything, but junior high school will be deeper.

We are in junior high school here in Jilin.

However, the textbook may have changed ......

The time of teaching varies from region to region.

I'm in junior high school.

I can learn, but it's different.

It's the second semester of the fifth grade of primary school, and we've just learned! ~

We also studied in junior high school

The number in the middle of a set of data arranged in order of size.

When there is an odd number (e.g. 17), the median is the middle number (the 9th);

When there is an even number (e.g., 18) of data, the median is the average of the two numbers in the middle (the ninth and tenth are added and divided by two).

For a finite set of data, their median is that half of the data in the group is larger and the other half is smaller. The way to calculate the median of a finite number of data is:

Arrange all the data of the same type in order of size. If the number of data is odd, then the middle data is the median of the group of data; If the number of data is even, then the arithmetic mean of the middle two data is the median of the group of data.

Median: That is, the number in the middle, is a way to measure the tendency of concentration.

Example 1: Find the median of this set of data.

Solution: First, the set of data is arranged (here in order from smallest to largest) to obtain:

Because this set of data consists of a total of 8 data, that is, n is an even number, so according to the calculation method of the median, the median = (23 + 25) 2 = 24, that is, the average of the fourth number and the fifth number.

Example 2: Find the median of 20, 20, 30 for this set of data.

Solution: First, the set of data is arranged (here in order from smallest to largest) to obtain:

Because this group of data consists of a total of 5 data, that is, n is an odd number, so according to the calculation method of the median, the median is 20, that is, the third number.

Average: All data from the whole group is required to calculate; Susceptible to extreme values in the data.

Median: It is only necessary to arrange the data in order; It is not susceptible to extreme values in the data.

mode: obtained by counting; It is not susceptible to extreme values in the data.

The formula for the median: then when n is odd, m=x(n+1) 2;When n is even, m=[x(n 2)+x(n 2+1)] 2.

To find the median, you must first sort the data (from small to large), and then calculate the ordinal number of the median, which is divided into odd and even numbers. When sorting, the same number cannot be omitted), and the median is calculated to avoid extreme data and represent the middle of the data population.

If the total number is odd, take the middle number in descending order, and if the total number is even, take the average of the two numbers in the middle.

Example: Median. First, Lu Feng divides 6 by 2 to calculate that the third number is 4, and then uses (4+5) 2=.

Median characteristics

1) The median is a representative value of the flag value of the whole unit determined by its position in all the flag values, and is not affected by the maximum or minimum value of the distribution series, so as to improve the representativeness of the median to the distribution series to a certain extent.

2) Some discrepancies affect the representativeness of the median when the distribution of the order of the scattered variables is skewed.

3) Tend to be in the middle of an ordered set of data.

The median is to arrange n data in order of size, and the data in the middle position is called the median of this set of data. The median is only related to where the data is arranged.

Arrange all the data of the same type in order of size. If the number of data is odd, then the middle data is the median of the group of data; If the number of data is even, then the arithmetic mean of the two data in the middle is the median of the data.

Example: Find the median of this set of data.

First, arrange the data in this group (let the group here be in order from smallest to largest) to get:

Because this group of data consists of a total of 8 data, n is an even number, so according to the calculation method of the median, the median (23+25) 2=24 is obtained, that is, the average of the fourth and fifth numbers.

1.The median is a representative value of the whole unit marker value determined by its position in the sail or burn plate marker, and is not affected by the maximum or minimum value of the distribution series, thus improving the representativeness of the median to the distribution series to a certain extent. State of Void.

2.For monomial series of discrete variables, the representativeness of the median is affected when the order distribution is skewed.

3.Tends to be in the middle of an ordered set of data.

If the total number is an odd number, the median is the number in the middle of the number.

If the total number is even, it is the average of the middle two.

Such as 1, 3, 5, 7, 9, 11, 13

The median is 7 such as 1, 3, 5, 7, 9, 11

Median (5 7) 2=6

The values of the variables in the population are arranged in order of size to form a series, and the value of the variable in the middle of the series of variables is called the median. For example, if it's an apple, the weight is sorted by: ,, 1, 1, and the median is.

A string of numbers, in order, (from smallest to largest or largest to smallest), odd numbers; The middle number is called the median.

Even-numbered numbers; The sum of the two numbers in the middle is called the median.

The number of middle positions in a set of data arranged from largest to smallest.

As. The median is 2.

Yes (2+3) 2=.

If the total number is an odd number, the median is the number in the middle of the number.

If the total number of mills per mu is even, it is the average of the middle two.

If you lose 1, you can fight 3, 5, 7, 9, 11, 13

The median is 7 such as 1, 3, 5, 7, 9, 11

Median (5 7) 2=6