Mathematical probability bar-shaped statistical graph demonstration device

Abstract

The invention belongs to the field of teaching aids, and particularly relates to a mathematical probability bar-shaped statistical graph demonstration device. The device comprises a box body, and a storage groove is formed in the box body; a tooth groove is formed in the upper end of the box body, a magnet block is attracted in the tooth groove, a handle is fixedly connected to the left end of thebox body, a box cover is installed at the bottom of the box body, elastic pieces are fixedly connected to the upper end of the box cover, clamping blocks are arranged on the surfaces of the elastic pieces, and supporting strips are fixedly connected to the upper ends of the magnet blocks. The number is expressed by designing a strip-shaped structure composed of the magnet blocks, the supporting strips, the adjusting sleeves and the fastening nails, rubber bands are installed on the symmetrically-distributed supporting columns and used for constructing measurement, the number represented by the bar chart is conveniently adjusted, use is convenient and visual, tooth grooves are designed in the box body, the magnet blocks can be placed in the different tooth grooves, adjustment can be conveniently conducted according to needs, the structure is simple, applicability is good, the manufacturing cost is low, and the device is suitable for wide popularization.

Description

technical field [0001] The invention relates to the technical field of teaching aids, in particular to a demonstration device for a bar chart of mathematical probability. Background technique [0002] The bar chart uses a unit length to represent a certain quantity, draws straight bars of different lengths according to the quantity, and then arranges these straight bars in a certain order. It is easy to see how many quantities are in the bar chart. bar statistics Figure 1 It is generally referred to as a bar graph, also called a long bar graph or a histogram. [0003] In the teaching process, it is often necessary to use demonstration devices to assist teaching. For example, when learning mathematical probability bar statistics, the use of demonstration devices can facilitate students to understand more intuitively. The patent authorization announcement number "CN 107993528 B" proposes a demonstration device for probability mathematics bar graphs. A plurality of bar-shap...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a demonstration device for a bar chart of mathematical probability, which solves the problems of complex structure and high manufacturing cost of the existing demonstration device for a bar chart of mathematical probability, and solves the problem of carrying a bar chart demo device. Inconvenient question

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