"Random Events" Probability Preliminary PPT Download

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"Random Events" Probability Preliminary PPT Download

Part One: Learning Objectives

1. Understand the characteristics of inevitable events, impossible events, and random events.

2. Understand the factors that affect the likelihood of random events occurring.

Random events PPT, part 2: creating situations and introducing new lessons

Which of the following phenomena are inevitable and which are impossible?

(1) Put the sugar into a cup of warm water and stir until the sugar dissolves;

(2) Measure the temperature on a certain day and the result is -150℃;

(3) The object falls freely under the action of gravity;

(4) When two positive numbers are added, the result is a negative number.

(1) It is inevitable;

(2) It is impossible to happen;

(3) It is inevitable;

(4) is impossible to happen.

Random events PPT, the third part: collaborative exploration and formation of new knowledge

touch ball game

Each of the three opaque bags contains 10 table tennis balls.

game rules

Each person takes out a ball from the bag of his choice each time, records the color, puts it back, mixes it well, and repeats the previous experiment. Each person touches the ball 5 times. Sort according to the number of times the yellow ball is drawn, the one with the most times is the first, the second is the second, and the one with the fewest is the third.

Necessary events:

Under certain conditions, when experiments are repeated, some events will inevitably occur in each experiment. Such events are called inevitable events.

Impossible event:

Under certain conditions, when the test is repeated, some events will not occur in each test. Such events are called impossible events.

Random events:

Under certain conditions, some events may or may not occur, which cannot be determined in advance. Such events are called random events.

Question 1: Five students participated in a speech contest, and the order of each person's appearance was determined by drawing lots. There are 5 paper sticks of the same shape and size in the tube, with the appearance numbers 1, 2, 3, 4, and 5 respectively marked on them. Xiaojun first drew lots. He randomly took a piece of paper from the lot without seeing the number on the lot.

Please consider the following questions:

(1) How many possible outcomes are there for the drawn numbers?

(2) Is the serial number drawn less than 6? What is this event?

(3) Will the drawn serial number be 0? What is this event?

(4) Will the drawn serial number be 1? What is this event?

Question 2 Xiaowei throws a dice with a uniform texture. The six sides of the dice are engraved with points from 1 to 6 respectively. Roll a die once and look at the upward side. Consider the following questions:

(1) What points may appear?

(2) Are the points that appear greater than 0? What is this event?

(3) Is the number that appears is 7? What is this event?

(4) Is the number of points that appears is 4? What is this event?

Random events PPT, the fourth part: analysis of examples, deepening and improving

Example: Point out which of the following events are inevitable events, which are impossible events, and which are random events.

1. Usually when heated to 100°C, water boils;

2. A basketball player takes one shot from the free throw line and makes a hit;

3． Throw a die, the up side is 6;

4． Measuring the sum of the interior angles of a triangle, the result is 180°;

5. Passing through an intersection with traffic lights in the city and encountering a red light;

6. A shooter shoots once and hits the bullseye;

7. The sun rises in the east and sets in the west;

8. People can live normally for 100 days without water.

Random events PPT, part 5: practice consolidation, comprehensive application

1. Among the following events, which one is inevitable is ( ).

A. A coin of uniform texture is tossed and it lands heads up

B. The lowest temperature on a certain day in Jianghan Plain in July is -2℃

C． Usually when heated to 100°C, water boils

D． Turn on the TV, the program "Boys and Girls Rush Forward" is playing

2. The following statement is correct ( ).

A. If the chance of something happening is only one in 100,000, then it can't happen

B. If the probability of something happening is 100%, then it will definitely happen

C． The winning rate of lottery tickets is 1%, so if you buy 100 lottery tickets, one will win.

D． There are 10 small balls of uniform texture in a bag, 9 of which are white balls and only one red ball. Then any ball picked from it must be a white ball.

3． In order to understand the age of 2,000 athletes participating in a certain sports meeting, the age of 100 athletes was randomly checked. The event "a certain athlete was drawn" is a _______ event, and the possibility of being drawn is.

4． Xiao Ming and Xiao Hua are playing a dice throwing game. The rules are as follows: after the thrown dice hits the ground, if the number of upward points is an even number, then Xiao Ming wins, otherwise Xiao Hua wins, then the game is _______ (fill in "fair" or "unfair.

Random events PPT, Part 6: Class summary

1. inevitable event

Under certain conditions, when experiments are repeated, some events will inevitably occur in each experiment. Such events are called inevitable events.

2. impossible event

Under certain conditions, when the test is repeated, some events will not occur in each test. Such events are called impossible events.

3． Random events

Under certain conditions, some events may or may not occur, which cannot be determined in advance. Such events are called random events.

4． Generally speaking, the probability of a random event occurring has a certain level, and the probability of different random events occurring may be different.

Keywords: Free download of PPT courseware for mathematics in the first volume of the ninth grade of the People's Education Press, download of random event PPT, download of preliminary probability PPT, .PPT format;

For more information about the "Probability Preliminary Random Events" PPT courseware, please click the Probability Preliminary PPT Random Events PPT tab.

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Update Time: 2024-07-11

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