Mathematical probability demonstration device

Abstract

The invention belongs to the technical field of mathematics tools, and particularly relates to a mathematics probability demonstration device which comprises a shell, a demonstration ball, end covers, a base and a controller, the shell is fixedly connected to the upper end of the base, and a first motor is arranged in the shell; the first motor is fixedly connected to the center of the base, and the output end of the first motor is fixedly connected with a rotating plate; the two end covers are located at the upper end of the shell, and the ends, away from each other, of the two end covers are connected with the inner wall of the shell in a twisted mode through first torsional springs. Through the arrangement of the ball body and the ball shell, the color of the demonstration ball can be changed by rotating the demonstration ball, on one hand, the situation that the number of demonstration balls carried in a single color is insufficient, and consequently the recording frequency of the demonstration balls is small is avoided, and therefore the accuracy of the statistical probability is improved; on the other hand, it is avoided that a user needs to carry a large number of demonstration balls of each color every time demonstration is conducted, and then the labor intensity of the user is reduced.

Description

technical field [0001] The invention belongs to the technical field of mathematical tools, and in particular relates to a mathematical probability demonstration device. Background technique [0002] Probability reflects the possibility of random events. Random events refer to events that may or may not occur under the same conditions. The number of occurrences is m times, that is, the frequency of occurrence is m / n. After a lot of trial and error, m / n is often getting closer and closer to a certain constant; this constant is the probability of occurrence of event A; now Classroom teaching demonstrations are often drawn by mixing demonstration balls of different colors, so that the demonstration balls of each color are recorded, and then the extraction probability of each color demonstration ball is counted; therefore, it is necessary to carry demonstration balls of multiple colors every time, so that Difficulty in carrying; when teaching, because the number of demonstration...

AI Technical Summary

Problems solved by technology

[0002] Probability reflects the possibility of random events. Random events refer to events that may or may not occur under the same conditions. The number of occurrences is m times, that is, the frequency of occurrence is m / n. After a lot of trial and error, m / n is often getting closer and closer to a certain constant; this constant is the probability of occurrence of event A; now Classroom teaching demonstrations are often drawn by mixing demonstration balls of different colors, so that the demonstration balls of each color are recorded, and then the extraction probability of each color demonstration ball is counted; therefore, it is necessary to carry demonstration balls of multiple colors every time, so that Difficulty in carrying; when teaching, because the number of demonstration balls of a certain color is insufficient, so under the condition that the number of demonstration balls of other colors cannot be changed, it is necessary to continue to increase the number of demonstration balls of this color, which will cause the number of demonstration balls of this color. Inaccurate probabilities for demo ball statistics

[0003] There are also some technical solutions about a mathematical probability demonstration device in the prior art. For example, a Chinese patent with the application number CN201810027565.7 discloses a probability mathematics device, including a base, a first bracket, a first Bearing, first rotating shaft, rocker, first bevel gear, second bracket, collection frame, third bracket, etc.; the first bracket is fixedly connected to the upper right side of the base, and the first bearing is embedded in the first bracket. The first rotating shaft is interferingly connected in the first bearing, the crank handle is fixedly connected to the left end of the first rotating shaft, and the first bevel gear is fixedly connected to the right end of the first rotating shaft; this technical solution realizes the probability of The purpose of stirring and drawing small balls; but this technical solution cannot avoid the insufficient quantity of demonstration balls of a certain color, so when the number of demonstration balls of other colors cannot be changed, it is necessary to continue to increase the number of demonstration balls of this color, It will cause the statistical probability of the demonstration ball of the color to be inaccurate, which in turn will cause the limitation of the technical solution

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