(1) Children's Pictorial

(2)4000x33% = 1320 (Ben)

2、

(1) 60+1-30%-25%-15%-10%) = 300 (person)

(2)300*(25%- 10%)= 45 (person)

3、

(1) Lake surface

(2)2 1

4、

(1) 320-20% x70% =1120 (only)

(2)320+20%= 1600 (only)

5、

(1) Telecom 1

(2)2 Telecom II

(3) No.1 Telecom Department

6、

( 1)225

(2)67.5 75

7、

(1)4- 10%x65% = 26 (person)

(2)4+ 10%x25%= 10 (person) 26- 10= 16 (person)

This part of the extended data mainly examines the knowledge points of the fan-shaped statistical chart:

According to the fan chart, the whole circle represents the total, and the size of each fan in the circle represents the percentage of each part in the total. The relationship between the number of each part and the total number can be clearly expressed through the fan-shaped statistical chart.

A statistical chart with the area of a circle representing the whole and the ratio of the area of a sector to the area of a circle representing the percentage of an item in the whole is called a sector statistical chart. The fan chart represents the total with the whole circle, that is, 100%, and the fan chart represents the percentage of each part in the total with each sector in the circle.

Use sector area to represent the percentage of parts in the whole; It is easy to display the size of each set of data relative to the total.

According to the statistical data, sort out or calculate the necessary data (including the percentage of parts in the whole); According to the data, calculate the degree of the central angle of each sector.

Draw a circle with appropriate radius as needed, and divide the circle into several sectors in turn according to the central angle with a protractor; Write the title of the statistical chart, complete the fan-shaped statistical chart with the help of a protractor, and mark the contents of each part and its percentage on each fan. Among them, parts are distinguished by dotted lines, solid lines or different colors.