"The Probability of Staying on the Black Brick" Frequency and Probability PPT Courseware 2

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"The Probability of Staying on the Black Brick" Frequency and Probability PPT Courseware 2

review:

1. What is the probability of getting a red ball?

P (touching a red ball) = the number of possible outcomes for drawing a red ball/the number of possible outcomes for drawing any ball

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

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

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

③If A is an uncertain event, then 0＜P(A)＜1

Example: In order to attract customers, a shopping mall set up a turntable that can rotate freely, and stipulated that customers who spend more than 100 yuan can get a chance to turn the turntable. If the pointer is aligned with the red, yellow or green area after the turntable stops, the customer can get 100 yuan, 50 yuan, and 20 yuan shopping coupons respectively (the turntable is divided into 20 sectors).

1. If customer A spends 80 yuan, will he get the opportunity to spin the carousel?

2. Customer B spends 120 yuan, what is the probability that he will get a shopping voucher? What are the probabilities that he gets 100 yuan, 50 yuan, and 20 yuan shopping coupons respectively?

Thinking training:

1. A car driver is going to the mall for shopping, and then he parks the car in a parking lot at will. The parking lot is divided into two areas, A and B. A parking space in the parking lot occupies exactly one square and each square has different colors. The outside is exactly the same, then the probability of the car parking in the blue area of ​​area A is ( ), and the probability of the car parking in the blue area of ​​area B is ( )

2. As shown in Figure A, B, and C, there are three freely rotating turntables. The turntable is divided into several sectors. When the turntable is rotated, the probability that the pointer will point to the white area after it stops is ( ), ( ), ( ) respectively.

Practice in class:

As shown in the picture: the turntable is divided into 16 equal sectors. Please paint the appropriate places on the turntable so that the turntable can rotate freely. When it stops rotating, the probability of the pointer falling in the red area is 3/8. What else can you do? Give an uncertain event, is the probability of it happening also 3/8?

Hands-on:

The kitten walks freely around the floor as shown in the picture. The probability that it will end up on a red square tile is 1/4. You try to paint the color of each tile.

Explore practice

A piece of paper with a password written on it is randomly buried in the rectangular area below (each square is the same size).

(1) In which area is it most likely to be buried?

(2) Calculate the probabilities of being buried in the three areas;

(3) Which two areas have the same probability of being buried?

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"The Probability of Staying on the Black Brick" Frequency and Probability PPT Courseware 3:

"Probability Staying on the Black Brick" Frequency and Probability PPT Courseware 3 Learning Objectives 1. Further understand the meaning of probability in specific situations and realize that probability is a mathematical model that describes uncertain phenomena. 2. Understand the calculation method of the probability of a type of event, and conduct a simple...

"The Probability of Staying on the Black Brick" Frequency and Probability PPT Courseware:

"The Probability of Staying on the Black Brick" Frequency and Probability PPT Courseware Review and Thoughts 1. What is the probability of touching a red ball? P (touching a red ball) = the number of possible results if a red ball is touched/the number of possible results of touching any ball 2. What are the probabilities and expressions of the three events? ①Must...

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Update Time: 2024-11-22

This template belongs to Mathematics courseware Beijing Normal University Edition Seventh Grade Mathematics Volume 2 industry PPT template

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