"Feeling the Possibility" Frequency and Probability PPT Courseware 3

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"Feeling the Possibility" Frequency and Probability PPT Courseware 3

New course introduction

Dice (tóu zi), also used as color (shǎi)

If a uniform die is thrown at random, then

⒈ Will the number rolled be 10? Won't

⒉ Does the number thrown must not exceed 6? must

⒊ Does the number thrown must be 1? uncertain

Consider the following events (1):

1. If 3 people are divided into two groups, there must be 2 people in the same group;

2. The sun rises from the east;

3. If today is Wednesday, then tomorrow is Thursday;

These things we are certain in advance will definitely happen. These events are called inevitable events.

⒋The sun rises from the west;

⒌ Negative numbers are greater than positive numbers;

6. Roll a uniform die and the number rolled is 10;

These things we are certain in advance will definitely not happen. These events are called impossible events.

Necessary events and impossible events are both certain events.

Discuss: List several certain and uncertain events in life.

①The sun rises from the east; ②The sun sets from the west; ③It will be sunny tomorrow;

④The payout point of rolling the dice is 5; ⑤ 1+1=2; ⑥ 1+1=3;

⑦The number 20 in our class is a girl; ⑧Turn on the TV and ads are playing;

⑨ Carve a boat and ask for a sword; ⑩� A coin, face up.

Try it out: Use dice with even texture to play a game with your tablemates. The rules are as follows:

(1) Two people play at the same time, each rolling a dice. Each person can roll the dice only once, or they can roll the dice several times continuously.

(2) When the sum of the points thrown does not exceed 10, if you decide to stop throwing, your score is the sum of the points thrown; when the sum of the points thrown exceeds 10, you must stop throwing, and your score is 0.

(3) Compare the scores of the two people. Whoever scores more points wins.

Discuss: When playing a game, if the sum of the points thrown previously is already 5, do you decide to continue throwing or stop throwing? What if the sum of the rolled points is already 9?

Xiao Ming thinks: The sum of the points thrown is already 5. According to the rules of the game, if the point is thrown again, if the point is not 6, then my score will increase, and the possibility of the point being thrown is not 6 is greater than the possibility of being 6. Big, so I decided to keep throwing.

Xiaoying thinks: The sum of the points thrown is already 9. If I throw it again, if the point is not 1, then my score will become 0, and the possibility of the point thrown is 1 is smaller than the possibility of not being 1. , so I decided to stop throwing.

Determine what each of the following events is:

1. A ball is drawn from the bag and it is a red ball. ( )

2. The ball found in bag A is a white ball. ( )

3. The ball drawn from bag B is a red ball. ( )

4. A ball found from bag B is a white ball. ( )

5. A ball found from bag C is a red ball. ( )

6. A ball found from bag C is a white ball. ( )

possibility

In the ball touching activity above, the color of the ball touched each time is uncertain.

If the number of red balls and white balls is not equal, then the probability of touching a red ball is different from the probability of touching a white ball.

Generally, the probability of an uncertain event occurring varies.

Classroom drill

1. Which of the following events are certain events? What are uncertain events?

(1) Drop oil into water and the oil will float on the water;

(2) Randomly throw a dice with uniform texture, and the number rolled is an odd number.

Answer: (1) is a definite event; (2) is an uncertain event.

2. Xiao Ming buys a movie ticket at will. Which is more likely that the seat number is a multiple of 2 or that the seat number is a multiple of 5?

Answer: Because there are more movie tickets with seat numbers that are multiples of 2 than there are movie tickets with seat numbers that are multiples of 5, so it is more likely that the seat numbers are multiples of 2.

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For more information about the "Frequency and Probability Feeling Likelihood" PPT courseware, please click the Frequency and Probability ppt Feeling Likelihood ppt tag.

"Feeling Possibilities" Frequency and Probability PPT Courseware 2:

"Feeling Possibilities" Frequency and Probability PPT Courseware 2 Learning Objectives 1. By judging various events in life, describe the characteristics of inevitable events, impossible events and random events, and be able to make accurate judgments. 2. Through the ball touch test, feel the random events..

"Feeling Possibilities" Frequency and Probability PPT courseware:

"Feeling Possibilities" Frequency and Probability PPT Courseware You guess you want to think about the following events (1): If a uniform die is thrown at random, then ⒈ will the number rolled be 10? ⒉ Does the number thrown must not exceed 6? ⒊ Does the number thrown must be 1?

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Update Time: 2024-11-27

This template belongs to Mathematics courseware Beijing Normal University seventh grade mathematics volume 2 industry PPT template

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