"Probability of Equally Possible Events" Probability Preliminary PPT (Lesson 2)

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"Probability of Equally Possible Events" Probability Preliminary PPT (Lesson 2)

Part One: Learning Objectives

1. Experience the process of "raising questions, guessing, thinking and communicating, abstract generalization, and solving problems", understand the characteristics of classical concepts, and judge whether the test results are equal or not based on the symmetry or balance of the random test results.

2. Master the probability calculation method of classical concepts.

3. Be able to design simple probability models that meet the requirements, and initially understand that probability is a mathematical model that describes uncertain phenomena.

Probability of equally possible events PPT, part 2 content: classic examples

[Example 1] (2019 Suihua) There are 2 red balls and 4 blue balls in an opaque bag. These balls have no other difference except color. The probability that a ball randomly picked out from the bag is a red ball is ()

A.1/3 B.1/4 C.1/5 D.1/6

[Example 2] There is a box of watercolor pens with no other difference except color. The quantity statistics of each color are as shown in the figure. Xiao Teng randomly picked out one watercolor pen without being able to see the color of the watercolor pen in the box. Xiao Teng drew The probability of blue watercolor pen is ()

A.1/10 B.1/5

C.3/10 D.3/20

[Example 3] You are given 8 balls that are identical except for color. Please design two ball-touching games to satisfy:

(1) The probability of touching the red ball is 1/4;

(2) The probability of getting a "white ball or green ball" is 5/8.

Probability of equally possible events PPT, part 3: Variation practice

1. There are 3 red balls, 2 white balls and 1 black ball in an opaque bag. They are exactly the same except for color. If a ball is randomly picked out from it, the probability of picking out a black ball is _______.

2. Xiaolin bought some candies for his younger brother and put them in an opaque bag. These candies were all the same except for the taste and the color of the outer packaging. The statistics of the number of candies of various flavors in the bag are as shown in the picture. He asked his brother to start from If a candy is randomly picked out from the bag, the probability that the younger brother happens to pick up the orange-flavored candy is ()

A.1/2 B.1/3

C.1/5 D.4/15

3. Please design a ball-touching game. The requirements are:

(1) There must be three kinds of balls: yellow ball, green ball and red ball in the bag;

(2) The probability of touching the ball: P (touching the red ball) = 1/4, P (touching the yellow ball) = 2/3, and find the probability of touching the green ball.

Probability of other possible events PPT, Part 4: Consolidation training

4. Randomly throw a uniform dice, the probability of rolling a number greater than 4 is ()

A.1/2 B.1/3 C.2/3 D.1/6

5. In a cloth bag, there are small balls of three colors: white, red and black. They have no difference except color. Among them, there are 2 white balls, 6 red balls and 4 black balls. Stir the balls in the bag. Evenly, close your eyes and randomly take out a ball from the bag, then the probability of taking out the black ball is ()

A.1/2 B.1/4 C.1/3 D.1/6

6. Xiaoling participated in a knowledge quiz activity in a class meeting. There were 6 Chinese questions, 5 math questions, and 9 comprehensive questions. She randomly selected 1 question from them. The probability of winning the math question is ()

A.1/20 B.1/5 C.1/4 D.1/3

7. In a lottery, if the probability of winning is 0.34, then the probability of not winning is ()

A.0.34 B.0.17 C.0.76 D.0.66

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For more information about the PPT courseware "Probability Preliminary PPT and Other Possible Events" PPT courseware, please click on the Probability PPT tab of Preliminary Probability PPT and Other Possible Events.

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Update Time: 2024-07-29

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