"The Probability of Touching the Red Ball" Frequency and Probability PPT Courseware

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"The Probability of Touching the Red Ball" Frequency and Probability PPT Courseware

review:

There are two balls in the box. They are exactly the same except for their color. Pick any ball out of the box.

1. If both balls in the box are red, if one is a red ball, it is called a ____ event; if one is a white ball, it is called a ______ event; (choose "inevitable" or "uncertain" ,"impossible")

2. If there is a red ball and a white ball in the box, and one is a red ball, it is called a ______ event.

explore:

(1) If there are 3 red balls and 1 white ball in the box, do the students think that if this student touches a ball, what color might the ball drawn out be? Communicate with peers.

(2) If each ball is numbered, namely ball No. 1 (red), ball No. 2 (red), ball No. 3 (red), and ball No. 4 (white), then the student touches each ball. Are the balls equally likely?

(3) If you pick up a ball at random, can you tell all the possible outcomes?

All possible results are: Ball No. 1, Ball No. 2, Ball No. 3, Ball No. 4. The possible results if the red ball is touched are: Ball No. 1, Ball 2, Ball No. 3.

think about it

(1) Can you write down the probability of getting a white ball?

Solution: P (touch the white ball) = 1/4

(2) If the ball-touching game is replaced by 4 red balls, what are the probabilities of touching the red ball and the white ball?

Solution: P (touched the red ball) = 1, P (touched the white ball) = 0.

(3) Can you write the probabilities of inevitable and impossible events?

Solution: P (necessary event) = 1, P (impossible event) = 0.

(4) Can you guess the range of probabilities of uncertain events?

Solution: 0

Practice in class

1. If one person from our class is randomly selected to play a game, what is the probability that you will be selected?

2. From a deck of playing cards (excluding the big and small kings), if one card is randomly selected, what is the probability of drawing a diamond? What is the probability of drawing a spade?

Solution: P (draw a diamond) = 13/52 = 1/4

P (draw a spade)=13/52=1/4

Do it

Design a ball-touching game using 4 balls that are identical except for color.

(1) Make the probability of getting a white ball 1/2 and the probability of getting a red ball 1/2;

(2) The probability of getting a white ball is 1/2, and the probability of getting a red ball and a yellow ball is 1/2;

Quick answer questions:

1. There are 1 red ball, 3 white balls and 5 yellow balls in the bag. Each ball is the same except for the color. If you randomly pick out a ball from them, then

P(touch the red ball)=______;

P(touch the white ball)=______;

P(touch the yellow ball)=______.

2. If you flip through the 2009 calendar at random, the probability of finding January 6th is _____; the probability of finding April 31st is _____.

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For more information about the PPT courseware "Frequency and Probability Probability of Touching a Red Ball", please click the Frequency and Probability ppt Probability of Touching a Red Ball ppt tag.

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"The Probability of Touching the Red Ball" Frequency and Probability PPT Courseware 2:

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Update Time: 2024-09-02

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

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