"Simple Probability Calculation" PPT Courseware 2

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"Simple Probability Calculation" PPT Courseware 2

Review review:

1. Generally speaking, in an experiment, if there are a limited number of possible outcomes, and each outcome is equally likely to occur, use m to represent the number of outcomes contained in a specified event E, and n to represent all possible outcomes of the experiment. The total number of , then the probability of event E occurring can be calculated by the following formula:

2. What are the probabilities and expressions of the three events?

①The probability of an inevitable event occurring is 1 and is recorded as P (inevitable event) = 1;

②The probability of an impossible event occurring is 0, recorded as P (impossible event) = 0;

③If E is a random event, then 0＜P(A)＜1

The probability of any event E occurring: 0≤P(E)≤1

teaching objectives:

1. Learn to use probability calculation formulas to calculate the probability of simple random events;

2. Cultivate students’ interest in learning mathematics and enthusiasm for using mathematics through familiar life problems.

Create situations and introduce new lessons

As shown in the figure, there is a freely rotating turntable, which is divided into six equal parts. What is the probability that the pointer points to an even number after each rotation stops?

Tracking exercise:

There are 6 red balls, 9 yellow balls, and 3 green balls in an opaque bag. There is no difference between these balls except their color. Now take out any ball from them.

(1) Calculate the probability of getting a green ball.

(2) If you want the probability of getting a green ball to be 1/4, how many more green balls do you need to put in your pocket?

Situation introduction:

Have you ever played the game of rock, paper, scissors?

Xiaoliang and Xiaoying play this game. The rules of the game are:

"Scissors" beats "paper"

"Cloth" is better than "stone"

"Rock" beats "scissors"

(1) If both of them make a random gesture, what is the probability that Xiao Liang will win the first time he "shoots"? What is the probability of Xiaoying winning?

(2) After two people take action at the same time, what is the probability of a draw?

Summarize, reflect and incorporate into the system

Through today’s study, what gains and new insights have you gained from the simple calculation of probability? Can you share your thoughts?

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"Simple Probability Calculation" PPT courseware:

"Simple Probability Calculation" PPT courseware learning objectives: 1. Further understand the meaning of probability in specific scenarios, and understand that probability is a mathematical model that describes uncertain phenomena. 2. Understand the calculation method of the probability of a type of event, and be able to perform simple Calculation. Learning is difficult..

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Update Time: 2024-09-30

This template belongs to Mathematics courseware Qingdao Edition Ninth Grade Mathematics Volume 2 industry PPT template

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