"Finding Probability Using Enumeration Method" Probability Preliminary PPT Courseware 4

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"Finding Probability Using Enumeration Method" Probability Preliminary PPT Courseware 4

The rules of the "Grab 30" game are: the first person says "1" or "1, 2" first, the second person has to say one or two numbers next, and then it is the first person's turn, and then the next person continues. Say one or two numbers, so that the two people take turns repeatedly. Each person can say one or two numbers each time, but they cannot say three numbers in a row. Whoever gets 30 first will win. The result is ( )

A. The one who reports the number first wins B. The one who reports the number last wins

C. Both may win D. It is difficult to predict

(2010 Panzhihua) As shown in the picture, there are three opaque cards, all the same except for the different numbers written on the front. After shuffling these three cards with their backs up, randomly pick one for the first time, and record the number marked on this card as k in the primary function expression. After shuffling it back, randomly select it for the second time. Draw one card and record the number marked on this card as b in the linear function expression.

(1) Write the probability that k is a negative number;

(2) Find the probability that the image of the linear function y=kx+b passes through the second, third, and fourth quadrants (use tree diagram or list method to solve).

think about it

(1) What are the advantages of the list method and the tree diagram method?

(2) When is it convenient to use the "list method"? When is it convenient to use the "tree diagram method"?

Tree diagrams or tables can be used to clearly represent all possible outcomes of an event, making it easier to find the probability of certain events.

When the test contains two steps, the list method is more convenient. Of course, the tree diagram method can also be used at this time;

When the test is in three or more steps, it is convenient to use the tree diagram method.

Classroom consolidation

1. There are four seats around a round table. A sits on the seat as shown in the picture first, and B, C, and D randomly sit on the other three seats. Find the probability that A and B are not sitting next to each other ( ).

2. When Xiaohong, Xiaofang, and Xiaoming played games together, they needed to determine the order of the games. They agreed to use the method of "hammer, scissors, and paper" to determine the order. What is the probability that all three people will play "cloth" in one round ( );

3. The turntable in the picture below is divided into six sectors of the same size and marked with the six numbers 1, 2, 3, 4, 5, and 6 respectively. The pointer is equally likely to stop in each sector. The four students each expressed the following opinions: A: If the pointer has stopped at sector No. 3 three times before, it will definitely not stop at sector No. 3 next time; B: As long as the pointer rotates six times in a row, it will definitely stop once. In the No. 6 sector; C: The probability of the pointer stopping in the odd-numbered sector is equal to the probability of stopping in the even-numbered sector; D: When you are lucky, just think silently before turning the pointer to stop in the No. 6 sector, and the pointer stops in the No. 6 sector. The possibility of sector No. 6 will increase. Among them, the opinions you think are correct include ( )

A． 1 B． 2

C． 3 D． 4

Keywords: Preliminary courseware for probability, courseware for finding probability using the enumeration method, PPT courseware for the first volume of ninth-grade mathematics published by the New People's Education Press, downloading the slideshow courseware for ninth-grade mathematics, downloading the preliminary PPT courseware for probability, downloading PPT courseware for finding the probability using the method of enumeration, .ppt Format

For more information about the PPT courseware "Using the Enumeration Method to Calculate Probability Preliminarily", please click the "Using the Enumeration Method to Calculate Probability ppt Probability Preliminary ppt" tag.

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Update Time: 2024-10-05

This template belongs to Mathematics courseware People's Education Press Ninth Grade Mathematics Volume 1 industry PPT template

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